The Bug:

For some reason when I modified some of the songs in the musics folder, absolutely NO song will play now

Ideas:
Captions:
"NO! NOT THE BEES!"
 - Line from Tubbo when Philza Minecraft spawned Withers on the "Bee Farm" in the Dream SMP

"Technoplane Neva Dies"
 - Joke about "Technoplane" returning when Technoblade found a carpet while playing terraria with tommyinnit(also technoplane's origin was on earth SMP)

"BEE BISCUIT FU-"
 - funny line Charlie(Slimeccle) screams when being blown up by an end crystal, while being morphed into a bee during one of tommyinnit's videos

"She's in your bed"
"But I'm in your twitch Chat"
 - Alt. Version of your new boyfriend lyrics? <.<

"Minceraft?"
 - Secret Minecraft Secrets

that's all I got for Captions, here's some other ideas(in which idk if you already planned to implement or not XD)

Character Creator Similar to Terraria's
Zoom Settings
Right click to Place Blocks(in settings could be a setting to toggle for left click or right click)

also if you want information about the bug here ya go

I kept all the File Names the same(basically renamed the .mp3 files to "day1," "menu1," ect...)

Songs I Replaced|Songs I Used

day1|Terraria overworld Theme Remix
day3|Dream's "Roadtrip" Piano Remix
mcunder3|Megalovania Remix
menu1|Dearly Beloved Remix
night2|Pigstep Remix

changed code bits of the "musics.json"
  {
    "day3": {
      "name": "Overworld Day Remix",
      "topic": "Terraria",
      "author": "Touhocaloid",
      "path": "musics\\day1.mp3"
    }
  },
  {
    "day5": {
      "name": "Roadtrip Piano Remix",
      "topic": "Dream(Youtuber)",
      "author": "Dario D'aversa",
      "path": "musics\\day5.mp3"
    }
  },
  {
    "mcunder3": {
      "name": "Megalovainia Remix",
      "topic": "Undertale",
      "author": "Magentium",
      "path": "musics\\mcunder3.mp3"
    }
  },
  {
    "night2": {
      "name": "Pigstep Remix",
      "topic": "Minecraft",
      "author": "Qumu",
      "path": "musics\\night2.mp3"
    }
  },
  {
    "menu1": {
      "name": "Dearly Beloved Remix",
      "topic": "Kingdom Hearts",
      "author": "Artic Empire",
      "path": "musics\\menu1.mp3"
    }
  },

I fixed the music bug, just renaming the files and leaving the config alone did it

another suggestion if you're reading would be a built in tool to add music