The MUS file extension is associated with the Finale, the world standard in music notation software created by MakeMusic. MUS file contains music notation information, but does not store actual audio data.
The MUS file extension is used for audio file by Electronic Arts games for the PS2 (PlayStation 2), PS3 (PlayStation 3), and PC. MUS file stores audio data for the game soundtrack and used for playing background music.
The MUS file extension is used for audio file by Minecraft, a 3D open-ended sandbox construction game. MUS file may stores music played by in-game Music Discs. They may be plain audio stored in the Ogg Vorbis (.OGG) format.
The MUS file extension is used by Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player for music file.
The MUS file extension is used by Doom and other games written with the original Doom engine. MUS file is audio file used for a MIDI music format.