A game with levels procedurally generated from music tracks
An indie game type rising in popularity lately. Very similar to Rhythm Games in that every level is a music track, it is nonetheless different. A Rhythm Game is a specific genre, with tracks already charted beforehand. A Music Player Game can be of any genre, but the levels are generated on the fly from the music you feed it, typically the more intensive and loud the music, the more action you are going to see. A very common thing in these games is an online scoreboard, with every song having its own - the most popular tracks, obviously, offering the strongest competition.