Music Disc (The End of the World) is a Music Disc added by NuclearCraft. When placed in a Jukebox it will play a MIDI rendition of the Skeeter Davis song "The End of the World" (as popularized by the game Fallout 4). It can be crafted by combining any music disc with an ingot of Uranium.
In-game, the disc is simply named "Music Disc". It can be identified by its magenta label.