[Question]
  [
It's time for CGCC to demonstrate our musical talent! In this challenge, you're going to compose songs while keeping your byte count as small as possible.
On Day 0, multiple answerers will post a function or program that outputs nothing/an empty string. They will also give a single line that next day's answers must output. More lines will be added to that line later, gradually building up a song. I'm not starting off Day 0 myself because letting multiple people answer will allow for more variety later.
On Day 1, answerers will choose an answer from Day 0. They will post a function or program that outputs the line from the Day 0 answer. This will be the song for the next answer. Like on Day 0, Day 1 answerers will also give a single line that next day's answers must add anywhere to their song.
On Day `i`, answerers will choose an answer from Day `i-1` with partial song `s` and line `l`. They can now insert `l` between any two lines in `s` or put it at the start or end of `s`. This will now yield a new partial song that each must write a function or program to output. Again, answerers will also give a line for next day's answers to add to their partial song.
# Rules
**The rules have been changed, please see the bolded parts below.** Sorry for the inconvenience.
* New lines can be put between other lines, at the start of the song, or at the end of the song.
* Lines may be repeated.
* Lines must be at least 20 characters and at most 100 characters.
* You may have trailing spaces at the end of each line when printing the song.
* **You may have multiple answers on a single day and you may answer on consecutive days, but you cannot continue from your answer on a consecutive day.**
* This isn't a hard rule, but if you take your line from a song, please link to it.
* The day changes at midnight UTC+0.
* Your score is the average length, in bytes, of all your answers (not including answers on Day 0), **divided by the number of answers you have posted** (this is a change from before, but the objective is still the same - make your answer as short as possible).
## It is currently Day 19.
# Examples
Note: These examples are just to show the format of each answer; they are not good examples of the kinds of songs you should write, as they lack creativity.
### Day 0. Python, 0 bytes
[Try it online!](https://www.google.com)
Line for next day: `Superman got nothing on me` (from [One Call Away](https://en.wikipedia.org/wiki/One_Call_Away_(Charlie_Puth_song)))
Song:
### Day 1. Foobarbaz, 7 bytes
```
DOSTUFF
```
[Try it online!](https://www.google.com)
**[Previous answer](https://linktopreviousanswer)**
Line for next day: `I can eat more bananas than him`
Song:
```
Superman got nothing on me
```
### Day 2. Foobarbaz, 11 bytes
```
DOMORESTUFF
```
[Try it online!](https://www.google.com)
**[Previous answer](https://linktopreviousanswer)**
Line for next day: `And I'm never gonna give you up` (modified from [here](https://www.youtube.com/watch?v=dQw4w9WgXcQ))
Song:
```
Superman got nothing on me
I can eat more bananas than him
```
### Day 3. somelanguage, 3 bytes
```
foo
```
[Try it online!](https://www.google.com)
**[Previous answer](https://linktopreviousanswer)**
Line for next day: `That's the only thing that matters`
Song:
```
Superman got nothing on me
I can eat more bananas than him
And I'm never gonna give you up
```
A possible song for day 4 (note that the new line was inserted this time instead of being appended):
```
Superman got nothing on me
I can eat more bananas than him
That's the only thing that matters
And I'm never gonna give you up
```
  
[Answer]
# Day 0. [Java (OpenJDK 8)](http://openjdk.java.net/), 5 bytes
```
a->""
```
[Try it online!](https://tio.run/##NYyxCoMwFEX3fsXDSaGG7mkdCx06OZYOrxrl2ZiE5EWQ4rengdrpXu453AkXrK1TZurfiWZnPcOUNxGZtBii6ZisEde9yIOLL00ddBpDgDuSgQ/sW2DkHIulHuZMypY9mfHxBPRjqLL4vznfDKtR@SP8lAYGuEDCuimKJKFdA6tZ2MjCZczlINA5vZanqpKwwZa@ "Java (OpenJDK 8) – Try It Online")
The line for tomorrow is `Baka mitai kodomo na no ne`.
thanks to caird for reminding me i don't need to submit a full program lol
[Answer]
# Day 0. [Jelly](https://github.com/DennisMitchell/jelly), 1 byte
```
⁸
```
[Try it on](https://www.youtube.com/watch?v=dQw4w9WgXcQ)[l](https://tio.run/##y0rNyan8//9R447//wE "Jelly – Try It Online")[ine!](https://www.youtube.com/watch?v=dQw4w9WgXcQ)
The line for tomorrow is `We're no strangers to love`
## How it works
`⁸` is a builtin for `[]` (the empty array), assuming no arguments are passed. Due to Jelly's printing, this displays nothing
[Answer]
# Day 0. [QBasic](https://en.wikipedia.org/wiki/QBasic), 0 bytes
Nothing to it.
The line for tomorrow is `Baby shark doo doo doo-doo doo-doo`
[Answer]
# Day 0, [Nim](http://nim-lang.org/), 0 bytes
[Try it online!](https://tio.run/##y8vM/Q8EAA "Nim – Try It Online")
Line for next day: `side to side, side, side to side`
Taken from [Revenge](https://www.youtube.com/watch?v=cPJUBQd-PNM) by CaptainSparklez. Instead of the first line, I chose one that can be compressed well.
[Answer]
# Python 3, 35 bytes
```
print("We're no strangers to love")
```
[Try it online!](https://tio.run/##K6gsycjPM/7/v6AoM69EQyk8Vb0oVSEvX6G4pCgxLz21qFihJF8hJ78sVUnz/38A "Python 3 – Try It Online")
Line for next day: `You know the rules, and so do I`.
It begins.
[Answer]
# Day 0, [Hexagony](https://github.com/m-ender/hexagony), 0 bytes
[Try it online!](https://tio.run/##y0itSEzPz6v8DwQA "Hexagony – Try It Online")
Tomorrow's line is: `A B C Ch D E F G H I J K Ll L M N Ñ O P Q R Rr S T U V W X Y Z`
from [the Spanish alphabet song](https://www.dailymotion.com/video/x5ec3dg)
[Answer]
# Day 0. [nameless language](https://github.com/bforte/nameless-lang), 0 bytes
[Try it online!](https://tio.run/##y0vMTc1JLS7@DwQA "nameless language – Try It Online")
Line for next day: `Juno was mad, He knew he'd been had, So he shot at the sun with a gun`, [Link](https://www.youtube.com/watch?v=I8sUC-dsW8A)
[Answer]
# Day 0. [Vyxal](https://github.com/Lyxal/Vyxal) 1 byte
```
¤
```
[Try it Online!](http://lyxal.pythonanywhere.com?flags=&code=%C2%A4&inputs=&header=&footer=)
Tomorrow's line is: `How ba-a-a-ad can I be? I'm just doing what comes naturally--` taken from [How Bad Can I be](https://genius.com/Ed-helms-how-bad-can-i-be-lyrics) from the Lorax.
Consequently, I now would like to be referred to as `The Lyx-ler` (a play on the name "the once-ler").
[Answer]
# Day 0. [unsure](https://github.com/Radvylf/unsure), 0 bytes
```
```
Line for next day: `1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19`
[Answer]
# Day 1. [Pyth](https://github.com/isaacg1/pyth), 25 bytes
```
j", "[Kj" to ",J"side"JJK
```
[Try it here](http://pythtemp.herokuapp.com/?code=j%22%2C+%22%5BKj%22+to+%22%2CJ%22side%22JJK&debug=0)
**[Previous answer](https://codegolf.stackexchange.com/a/224578/78186)**
Line for next day: `do you like my sword, sword, sword my diamond sword, sword`
The song so far:
```
side to side, side, side to side
```
[Answer]
# Day 1. [Vyxal](https://github.com/Lyxal/Vyxal) `S`, 19 bytes
```
`⟇ɽ to``⟇ɽ,`ȮȮ$Ȯṫ_W
```
[Try it Online!](http://lyxal.pythonanywhere.com?flags=S&code=%60%E2%9F%87%C9%BD%20to%60%60%E2%9F%87%C9%BD%2C%60%C8%AE%C8%AE%24%C8%AE%E1%B9%AB_W&inputs=&header=&footer=)
[Previous answer](https://codegolf.stackexchange.com/a/224578/77516)
Song:
`side to side, side, side to side`
Line for next day: `Tell me, tell me if you love me or not, love me or not, love me or not?` from [Maroon 5 - What Lovers Do](https://www.youtube.com/watch?v=5Wiio4KoGe8)
[Answer]
# Day 0. [C (gcc)](https://gcc.gnu.org/), 5 bytes
```
f(){}
```
[Try it online!](https://tio.run/##S9ZNT07@/z9NQ7O69n9mXolCbmJmnoYmVzWXAhAAha25av//S07LSUwv/q9bDgA "C (gcc) – Try It Online")
Next line: `YOU ARE LIKELY TO BE EATEN BY A GRUE` [(MC Frontalot "It Is Pitch Dark")](https://www.youtube.com/watch?v=4nigRT2KmCE&ab_channel=MCFrontalot)
[Answer]
# Day 0, [Charcoal](https://github.com/somebody1234/Charcoal), 0 bytes
[Try it online!](https://tio.run/##S85ILErOT8z5DwQA "Charcoal – Try It Online") ~~Link is to verbose version of code.~~
Next: line: `Deck the halls with boughs of holly, Fa la la la la la la la la!` Optional comma between the fourth and fifth `la`.
[Answer]
# Day 0. [Befunge-98 (PyFunge)](https://pythonhosted.org/PyFunge/), 1 byte
```
@
```
[Try it online!](https://tio.run/##S0pNK81LT9W1tNAtqAQz//93@P8fAA "Befunge-98 (PyFunge) – Try It Online")
Line for next day: `I'm only human after all` (from [Human](https://en.wikipedia.org/wiki/Human_(Rag%27n%27Bone_Man_song)))
[Answer]
# Day 1, Deadfish~, 323 bytes
```
{{i}ddd}iiic{ddd}ddddc{iiiiii}ic{{d}iii}iic{{i}ddd}iiiiiicdddciicddddddc{{d}iii}ic{{i}dd}iiiicdddddc{{d}ii}ic{{i}ddd}ciiiciiiiic{d}c{{d}iii}iic{{i}dd}dciiiiiicdc{{d}ii}ddddc{{i}d}dddc{d}dddddc{d}iiic{ii}dc{{d}ii}ddddc{{i}dd}iic{d}dddcddddc{i}icdddc{i}iciiiiic{{d}i}ic{iiii}ic{ddd}ddddc{{i}ddd}c{{d}ii}iiic{{i}ddd}iiiciiiiic
```
[Try it online!](https://tio.run/##ZVBJCsAwCHxRH1ViSz33KPN269oQEggZnEUNXSfd/D6HqgiDiMDMQxzYpSEcB1aT4OD0lLradfmEo3UlQ2t@DjNhOJcpRu09QKObtLmCDCBQDhogYlyyawnZwgu1GHLyADWCu8C5NJZv6Hl7g/UXyq/6AQ "Deadfish~ – Try It Online")
Song so far:  
`I'd like to find out what reality I'm in`
Next line:
`We wish you a Merry Christmas and a happy New Year!`
[Previous answer](https://codegolf.stackexchange.com/questions/224562/compose-a-song-line-by-line/224584#224584)
[Answer]
# Day 0, [PHP](https://php.net/), 0 bytes
[Try it online!](https://tio.run/##K8go@G9jXwAk//8HAA "PHP – Try It Online")
Next line: `I'd like to find out what reality I'm in` ([Night Verses "Phoenix IV: Levitation"](https://www.youtube.com/watch?v=b1js-01XnQY))
Nothing planned to reduce byte counts, just currently listening to this amazing album, it kinda have lyrics (voice samples), and I like that line
[Answer]
# Day 1, Javascript, 67 / 131
## Printing it, 67
```
_=>`A B C Ch D E F G H I J K Ll L M N Ñ O P Q R Rr S T U V W X Y Z`
```
## More interesting but longer, 131
```
_=>[...Array(30).keys()].map(i=>i^3?i^12?i^16?i^21?String.fromCharCode(65+i-(i>3)-(i>12)-(i>16)-(i>21)):'Rr':'Ñ':'Ll':'Ch').join` `
```
[Previous](https://codegolf.stackexchange.com/questions/224562/compose-a-song-line-by-line/224568#224568)
Next line: `Money money money, it must be funny, in a rich man's world` ([from here](https://www.youtube.com/watch?v=ETxmCCsMoD0))
[Answer]
# Day 1. Picolisp, ~~47~~ 42 bytes
```
(prin"Baby Shark doo doo doo-doo doo-doo")
```
---
### Much more interesting, 47 byte version
```
(prin(text"Baby Shark @1@1@2@1@2@1""doo "'doo-]
```
---
Next lyric: `you're not JoKing, you're`
[Previous lyrics](https://codegolf.stackexchange.com/a/224567/90614)
I'd also post the full song so far, but I don't want to accidentally read it myself.
[Answer]
# Day 1, [Zsh](https://www.zsh.org/), 28 bytes
```
<<Z
I'm only human after all
```
[Try it online!](https://tio.run/##qyrO@P/fxiaKy1M9VyE/L6dSIaM0NzFPITGtJLVIITEn5/9/AA "Zsh – Try It Online")
Song so far:
```
I'm only human after all
```
Next line: `I'm only human after all` (yes, that's the same line repeated again - that's how the song goes...)
[Answer]
# Day 1. [Vyxal](https://github.com/Lyxal/Vyxal), 43 bytes
```
`λ… ba-a-a-ad λ‹ I be? I'm λ¾ °Ḋ λ⟨ †↲ ₀⅛--
```
[Try it Online!](http://lyxal.pythonanywhere.com?flags=&code=%60%CE%BB%E2%80%A6%20ba-a-a-ad%20%CE%BB%E2%80%B9%20I%20be%3F%20I%27m%20%CE%BB%C2%BE%20%C2%B0%E1%B8%8A%20%CE%BB%E2%9F%A8%20%E2%80%A0%E2%86%B2%20%E2%82%80%E2%85%9B--&inputs=&header=&footer=)
**[Previous Answer](https://codegolf.stackexchange.com/a/224566/101522)**
Line for tomorrow: `If it's all right, then you're all wrong.` From [*I Know, You Know*](https://genius.com/The-friendly-indians-i-know-you-know-lyrics), a.k.a. the [*Psych*](https://en.wikipedia.org/wiki/Psych) theme song, by The Friendly Indians
---
Song so far:
```
How ba-a-a-ad can I be? I'm just doing what comes naturally--
```
[Answer]
# Day 1, [brainfuck](https://github.com/TryItOnline/brainfuck), 677 bytes
```
++++++++++[>++++++++++>+++++++++++>+++++>++++++>++++<<<<<-]>+.>+.+++.>>-.<<----.>>---.<++.<++.<.+++++.>>>.<<<--------.>++++.----.>>+++.---.<<<.>-.<+++.++++.>++++++.<-.>-.-----.+.+++++++.<-------.>>>.<<<+++++++.>>+.<-------.-.+++.>.>.<<<.>---.<------.>>>.<<<++++++.>>.<+.>---.>+.<<<.>>+++.<<-----------.>>--------.>.<+++++.+++.--------.<------.<.>+++++++++++++.<++++++++++.++.+++++++.>>>-----.<<<-.--------------------.>>>-.++.<<<++++++++++++++.>.<++++++.>--.<----------.>------.++++++.>>++++.<<<----------.>>.+++.<<++++++++++.>-.<-.>-----.-----.<++.>+++++++++++.------.+++++.----.-.<+.>>>++.<<<++++.--------.>-----.++.---.++++++++++++.+++.<++++++.++++++.----.-.------.++++++++.
```
[Try it online!](https://tio.run/##bVFLCkIxDDxQyJwg5CLiQgVBBBeC56/59TUVw/uk02Q6mV7fl8fr/rk9x6AjTrryllaubSEefFaCPbaGKsMQC0/tKwbGi@gyVCFZkVWBVkOlXgCN3mAl1JkQdjw7cyvRSZbkEzfCtcepD1rsfsy/NviCssD7vTiELdHHdJUiWzEn4U4u6BamG0dOawgtxnAH/CeiBKFEaOecEkI3pPfUf1mSs2w1igQ7I6fZ6R3Pq@yzoFOjTJaYZInEjxLUFW/ymy2gjW5Tb/AYXw "brainfuck – Try It Online")
[Previous answer](https://codegolf.stackexchange.com/questions/224562/compose-a-song-line-by-line/224570#224570)
Song so far:
```
eor;n84pej8btp;8boeiuhtopwa8h5por58hob8h5p29h5]-925-j]wgip4o[35iwoueou9[-0etdojfuotpog;kcjliuxiokjdl
```
Next line:
```
You are my SyntaxError, my only SyntaxError.
```
Makonede, maybe get some singing lessons?
*I learned brainfuck for this.*
[Answer]
# Day 2, PHP, follows [this](https://codegolf.stackexchange.com/questions/224562/compose-a-song-line-by-line/224676#224676), 75 bytes
```
<?=$a=side," to $a, $a, $a to $a
",$i='Oh-u',"-$i-$i $i-$i-Oh I'm falling";
```
Song so far:
```
side to side, side, side to side
Oh-u-Oh-u-Oh-u Oh-u-Oh-u-Oh I'm falling
```
Next line:
```
Na, na, na-na-na-na, na-na-na-na, hey Jude
```
From [Hey Jude](https://www.youtube.com/watch?v=A_MjCqQoLLA)
[Answer]
# Day 14, [Charcoal](https://github.com/somebody1234/Charcoal), 450 bytes
```
⟦⪫Ｅ313…side to ×Ｉι⁴, ⟧Ｆ²⁺…Oh-u-⊗⁺ι⁶ “P➙⭆BＸ5↶÷ρ⦄⟧⁸A>ιZ›➙πα⊗σ*7¹´$⁹“ＢzＩ⊞³⌈”× la⁸“[¶²/;pv﹪ＨD⦃»ⅉδE4pＰf·⁹E”⪫Ｅ³… round and¹⁶,¦⸿It won't be long⪫Ｅ³ yeah (yeah)¦,⪫⪪“Z⧴aC¿Jy⌈←*üYlΦθd;hＡ⊗Ｕ±”¶¦ catchy⪫⟦⸿Please ¦ (¦)⸿A⟧don't be long×a³⁵⪫⪪“T⊞8⁻‖⟧e2ü"↑«℅γ“=βk²↨r⊟h‹⬤ＢY=⁰”¶¦Galileo…o-⁹⸿Ｆ²⁺× on the wall, ι”- ⊟d⌈Pï⌊;∕1/↖⍘”⸿⪫Ｅ..,!⁺⁺×No, you can't. ‹!ιYes, I canι ¦⸿N…o n¹⁹!× Mama mia³⪫⪪“\`↖⮌3&℅⮌ü⎇Y,L¦⊞⊟η*"Ｄμ◧À⬤×(»q#⌕´⁸.₂Ｏ3K”¶”↶↥%q7*Ｊ↑º⌕+”Ｆ⪪, my only¶.¦¶⁺ SyntaxErrorι
```
[Try it online!](https://tio.run/##bZNRb9owEMff9ykOv5BIAaljq4b6NNG1YhodEn2pmj6Y5EgsOT7kOLB8enZ2Cg0UCUWOufvd3f9/yUppM5L6cFhaZVz0@puUiRZyG4nJzUQkMGszjbOS@KJWOYIj4NtnVWEdzWTtIhUn8C2O@cn3In6L775syEL0NYYOudQNh35g/pajZsSx99SsNebd/yqB2w7CDEZ0qWI@rGAjtVamSO09GdgjGNoDNRYK2YLcbqVFncCDFKesrjkBWnKVHz1aap9LhH2JqGtgmOO3dVNDQR/Jp/knZ7ODpcbkIE3OzJvbblxxxp472JMZOlgjaDLFdaaAFmUJkX/G4hITIldbrQJxRalJ@AfKDWuom6wEmRqoPZwTUxPyIZMuK9tLyisDlhpljcEYiII9qf0p3viQn3d6qZ1XbvL9el/lILVRamLwnZ0O3NeDKqQlWMjCqI3Kei0@Sq00Uq9OT1ryyzA9k1JcX6Kjse/W7Xkxwtb5FRTTKazJOY1s7YYnQys@MS/sEONxMuD8AO9XeKIEWmpYWVZp7Ev8wZrvB6GYr/aCdQJzH@AHVMfN7dV7EleHBeMXqD/u4PPmLmQloVLBhesmgEYHFfLqciWvv2EDoke1w9B4s2WnX/jAXwdUbc8K3CF/OmSMhIKjg0ZB6ndwwuEssG5TMz6m9T0QsGqNk/9@WUu2k@PucDiMdvo/ "Charcoal – Try It Online") Link is to verbose version of code. Song so far:
```
side to side, side, side to side
Oh-u-Oh-u-Oh Oh-u-Oh-u-Oh-u I'm falling
Don we now our gay apparel, Fa la la la la la la la la
The wheels on the bus go round and round, round and round, round and round
It won't be long yeah (yeah), yeah (yeah), yeah (yeah)
So catchy, catchy, it's such a catchy song
Please don't be long (don't be long)
Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah!
(Galileo) Galileo, (Galileo) Galileo, Galileo Figaro Magnifico-o-o-o-o
99 bottles of beer on the wall, 99 bottles of beer
No, you can't. Yes, I can. No, you can't. Yes, I can. No, you can't. Yes, I can, Yes, I can!
No no no no no no no! Mama mia Mama mia Mama mia let me go
Never gonna give, never gonna give (Give you up)
You are my SyntaxError, my only SyntaxError.
```
Next line:
```
No juggernaut can stop us, no 4000
```
[Answer]
# Day 16. [Jelly](https://github.com/DennisMitchell/jelly), 487 bytes
```
Wẋ3j⁾, 
““ to “, ”m0j“¡⁶G»”
“Oh“u”ŒḄ⁺j”-¤ɼ⁶®⁾-u⁶“µçṃtẉṛ»”
“œɗ:eĖḤQO⁴ẹḂÐMẠ⁷¦ŒŒ%»“ la”ẋ8¤”
“ɗ%'Ƈạẉṗß¥TÄḍ^qĖ»⁶“ØQ¤[ṛŻċ¤»Ç”
“;Ȯṗạḥ!ƭ⁽5⁾Ỵ»⁶“¡Ḷqɓ®rʋʠ»Ç”
“¢wðÇ8ṗȤḃȯ}Ėdẇ³ʂƙḷĖẈß5ʋu⁴»”
“)ọa»“ “ (“)”j“⁸v°Ȧ¢eṠCÄ»$”
”A”aẋ31¤⁾h!”
“(“) “, (“) “, “ ”j“©V°»$“ÆƥṠ=_eiȯẸʂIḄɱƇ»”
99“×&ṛƲȯ8+c6»ɼ“¬!}Ẇ?ɠ'Ạ01nṄ»®”
“¡ñeḣCṀƝṃṘ¡mLṁĠ"61ṁḂ"Ẉ»;⁶¤ẋ3$ṖṖ“ṃƇṆḶẆ ßḲP!»”
“Ẉ¿Jl»“ịPẠ»⁺⁺“¡µƈ`ȯ»“ḅiṢ»⁺⁺Ṗ⁶99®⁾!
“©ƒḣȦdḋL»,Œl$j⁾, “£ZAɦŻ/ıṙċṫ»”
“€¦ẒtFḷœ»“f#İ⁽s»ɼ“¢ẈĊⱮĖu»®⁾.
“çḥƭ~l?JⱮŻṁ^ƊƊg|ʂ»⁶4ȷ”
“Na, na, ”⁾naWẋ4¤j”-¤;⁾, ¤⁺“¡ẠȥỤC»
```
[Try it online!](https://tio.run/##TVNtSxRRFP7er9g1zaK1lFTcJESEIrFUiIICa8ktldUwtQgynNVccxFihV0lF3fX2Q1J98V8uTO3DM68MLP/4swf2c6dWRfhztw7c85zXp7n3KlwJPKpVnuGavzOlCOdB3xXnKUdWr75dz7aAvRKT7dP0RGyjnT6ADj9ED7DE/RaoA8jgWzFkVTySbeBbP8hNyhSrLYFOgngifYTleV5VL@h8qMRwNi0U3fDehKZPDrsSMeoKsii2vdHqGYc6QwKRsJItAj3HV8kRCCqsQfkOtpOtbSaMVSzbtSUtgv5J9oKso2xWT1JIDeztjUK8gtKanA9DjJwLVaH91pFQgk4y/vNQ0f620UVIz@@gAJZTmftTSi@r8armUtQyH3Uylqsh/CWjGzZKi3qyXFUY/C7GjW3kZ1RT@qatttVjRMDx42GbyDfCHn9iOe6@EUmwa0jsQ9QtgqQC6OSGdBWgDd7qHQ/PSEhTwf1Lp1P@OvRXLgn0aWjF9yNCftPoezG2dFWzTzFvfcyPGmVUGXV6EPSzK6YMa@4YFA4pa4RU@aRVeq5@bobOAlJQQ78i6iu9tmZVpKlvWMGFaqN5K1zkdUqYWR7A6gsmWkSGZUtyE4PoSLpmabuDtpJ0yaiA3ivmAtZdNKMSpIW4QlBIiqrxDVl8Wm7yI5G/A3GBO7fYMTlDHl8hEoQ@qhiieRwYq69skqenX2dRCV3YRfxpdNg0J1Ev1vrvkmTumcVxpHFh4AHjESk2Zt5Yd173m8XDH5br6CyrcdR@dUow4keQAHVxPx9EtfYdNO9uaqXaWrmLnjKUa36ulMp6skFlyDp/JbA0uizvHn4JdI3SEaDEyNj5rq5/vZzNerOWqd1Vk/zOBTwzYTcG0fomZC4lJ0g1@9Vr1upmAGvd@LCyiOXB4DXav8B "Jelly – Try It Online")
## Output
```
side to side, side, side to side
Oh-u-Oh-u-Oh Oh-u-Oh-u-Oh-u I'm falling
Don we now our gay apparel, Fa la la la la la la la la
The wheels on the bus go round and round, round and round, round and round
It won't be long yeah (yeah), yeah (yeah), yeah (yeah)
So catchy, catchy, it's such a catchy song
Please don't be long (don't be long)
Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah!
(Galileo) Galileo, (Galileo) Galileo, Galileo Figaro Magnifico-o-o-o-o
99 bottles of beer on the wall, 99 bottles of beer
No, you can't. Yes, I can. No, you can't. Yes, I can. No, you can't. Yes, I can, Yes, I can!
If I try, try, try, I can drink, drink, drink 99 bottles of beer!
Never gonna give, never gonna give (Give you up)
You are my SyntaxError, my only SyntaxError.
No juggernaut can stop us, no 4000
Na, na, na-na-na-na, na-na-na-na, hey Jude
```
[Previous Answer](https://codegolf.stackexchange.com/a/225583)
Next line: `I used to rule the world, chunks would load when I gave the word`
From CaptainSparklez's Fallen Kingdom (a Minecraft parody of Viva la Vida).
<https://www.youtube.com/watch?v=I-sH53vXP2A>
[Answer]
# JavaScript, 39 bytes (boring)
```
_=>'Baby shark doo doo doo-doo doo-doo'
```
[Try it online](https://tio.run/##y0osSyxOLsosKNHNy09J/Z9m@z/e1k7dKTGpUqE4I7EoWyElPx@GdZFo9f/J@XnF@Tmpejn56RppGpqa/wE)
# JavaScript, 53 bytes (more interesting)
```
_=>'Baby shark'+' doo-doo'.repeat(3).replace('-',' ')
```
[Try it online](https://tio.run/##FcY7DoAgDADQq7AVorA44@BFTIXij1ACxsTTow4veQfeWF3Z86UTe2rBttmOMOHyiLphOaED4Zn1B0yhTHjJQf2L6EiChh4EqOY4VY5kIq8ySKXaCw)
The song so far is `Baby shark doo doo doo-doo doo-doo` and the next line is `I'm gonna get ya get ya get ya get ya` from Blondie's "One Way Or Another". Yes, 70s stuff.
[Answer]
# Day 1, [PHP](https://php.net/), 34 bytes
```
<?=$a=side," to $a, $a, $a to $a";
```
[Try it online!](https://tio.run/##K8go@P/fxt5WJdG2ODMlVUdJoSRfQSVRB4ohPCXr//8B "PHP – Try It Online")
[Previous answer](https://codegolf.stackexchange.com/a/224578/90841)
Song so far:
```
side to side, side, side to side
```
Next line: `Oh-u-Oh-u-Oh-u Oh-u-Oh-u-Oh I'm falling` ([Twenty One Pilots "Ride"](https://www.youtube.com/watch?v=Pw-0pbY9JeU))
[Answer]
# Day 0. [05AB1E](https://github.com/Adriandmen/05AB1E), 0 bytes
[Try it online!](https://tio.run/##yy9OTMpM/Q8EAA "05AB1E – Try It Online")
Line for next day: `eor;n84pej8btp;8boeiuhtopwa8h5por58hob8h5p29h5]-925-j]wgip4o[35iwoueou9[-0etdojfuotpog;kcjliuxiokjdl`
Song:
---
```
  # full program
  # implicit output
```
[Answer]
# Day 2, [Python 3](https://docs.python.org/3/), ~~103~~ 101 bytes
```
a=' sword'
b=a+','+a
c='side'
d=c+' to '+c
print(d+f", {c}, {d}\ndo you like my{b},{a} my diamond"+b)
```
[Try it online!](https://tio.run/##DcaxDoQgDADQna9oXHqXsjnzJ7cUqpF4UqMYQwjfji4vby950TT2zg7hvPUQNN4xoUViExyeUSY04gIhZAWkYPYjpvwRmgcLNbQXab8kCkUv@Md1gq1U32zl9g4k8qZJBvLf3h8 "Python 3 – Try It Online")
[Previous answer](https://codegolf.stackexchange.com/questions/224562/compose-a-song-line-by-line/224623#224623)
Song so far:
```
side to side, side, side to side
do you like my sword, sword, sword my diamond sword, sword
```
Next line: `Wo-o-o-o-o-o-oah, wo-o-o-o-o-o-oah` from [here](https://www.youtube.com/watch?v=0fTUj9mfnUk)
[Answer]
# Day 3. [05AB1E](https://github.com/Adriandmen/05AB1E), 51 bytes. My score: \$8\frac{2}9\$
```
“We're€¸æÊs€„„Î
Youƒ€€€‰ï€ƒ€Ê€· I
A‚è©—'s€À I'm™Ð€‚
```
[Try it online!](https://tio.run/##yy9OTMpM/f//UcOc8FT1otRHTWsO7Ti87HBXMZD1qGEeEB3u44rMLz02CSQAQQ0bDq8H0mChw10gLdsVPLkcHzXMOrzi0MpHDVPUQboPNyh4quc@all0eAJY06z//wE "05AB1E – Try It Online")
[**Previous answer**](https://codegolf.stackexchange.com/a/224709/94066)
Line for next day: `You wouldn't get this from any other guy`
Song:
```
We're no strangers to love
You know the rules and so do I
A full commitment's what I'm thinking of
```
---
```
“...  # trimmed program
“...  # push "We're no strangers to love\nYou know the rules and so do I\nA full commitment's what I'm thinking of"
      # (implicit) end compressed string
      # implicit output
```
[Answer]
# Day 3, [Splinter](https://esolangs.org/wiki/Splinter), 160 bytes
```
A{B{\s\i\d\e}BZ{\ }Z\t\oZB}C{\,Z}ACBCA\
D{E{F{\O\h}F\-\u}E\-}DDFZDDEZ\I\'\mZ\f\a\l\l\i\n\g\
\D\o\nZ\w\eZ\n\o\wZ\o\u\rZ\g\a\yZ\a\p\p\a\r\e\lC\F\aG{Z\l\a}GGGGGGGG
```
[Try it online!](https://tio.run/##tVVNj9owEL3nV4xyKbQbRJC60qKlEp@rnno3w8ElhlgNTuQYKIry2@kEAiRASD@2EymS7fHMvJc3k2hn/FB19pEOl9ADbdv2vp8MEoxRoociHbAEIWVoMGSDdJjgE0v7w8Gwj9YoGSeTBL@hn07QwXU6RicdjSZsNBoz/IofcMVwgRwDeiQqXKKFIwxRMdyiYLQT4pbRa42a0SnHHaNXRA9HjQKDIU6QvyWMAvD07WR7qtKy5CoKtYF4F1tkK7Gi@qe2PYOP0Hm2rK0vAwGBUI0MWxO@QLtrAZlcQKi9w@60PaODHjx/Bq688vZrD17yG5ltKHrbOi8lLTvnlUcr97xStMoKPPsuSmW4l6D56SGnO4Me3Uvs8nFmRyjeBcK1UQwJr5cs971OtSn4dEwpZ1al46kseSwL0a4OeiJEUmD3sddvF1pV8CNfEcSiPmKkpTJgj7UO9ROs1YqbuS/VEr5rPv8hTAxSgfHFIaXmq5ZdG5I02BI/pWk0rerarhhN6ggtyFSCA@59qZ6OruRaZZlSvdrP9DdEntnbShopawMc4iggD6GJUE/OuQn1f@IyreHyiNqpQP0Y7TvKpQZadQvRcJuWhpNDOphlnTHtOu5tU2xK86hMmVtN2TtAvQOREm@ylFfqzP84FdDyhne7F3C3nykPcVRC7nkB2r4zuR6P4qz42Hgk3tZWSyMaOWHNhzUUOeMK6HZE6pcqNno9NzJUhY6Y@5yozFrChLnnFYl3CCzC7FTBLI6Tf2vMqwpuMqWVmf5IMTdpiswWIWca2P8C "Python 2 – Try It Online")
[Previous answer](https://codegolf.stackexchange.com/a/224764/100664)
Song so far:
```
side to side, side, side to side
Oh-u-Oh-u-Oh Oh-u-Oh-u-Oh-u I'm falling
Don we now our gay apparel, Fa la la la la la la la la la
```
Next line: `The wheels on the bus go round and round, round and round, round and round`
]