Accolade MIDI File Format
From Just Solve the File Format Problem
Description
This format, used in Accolade's 1992 DOS game "Speed Racer in The Challenge of Racer X" appears to be a MIDI clone.
Information
AdPlug's AdLib file formats reference library entry for the format hosts an archive containing a MIDI to .mus converter, a player for the format and the music files from the game.
This description, of a .mus file format based on MIDI, is perhaps related.