I remember playing .mod files on the Amiga. Unless this is a mixed up memory from my C64 days, there was a music demo or player that would play the song and showed a band playing at the same time. It had 4 musicians, IIRC: a guitar, drums, singer, and keyboard. As the song played, it would cause the musicans to play.
Does anyone know the app I'm talking about? Sorry the descrip is fuzzy, but its the best I can recall from years ago.
Cheers,
Dr. A>