before .MP3s, before high speed internet, there was a high demand for small-size multimedia files. MIDI files weren't particularly flexible, so the .MOD audio format emerged with support for a wider range of embedded instruments and effects... this was probably one of the greatest .MOD files written before the whole .MOD scene went the way of the dinosaurs.
and because this was an Amiga MOD, it was limited to only 4 channels. for its format, it was an impressive 640KB