Future Composer
Amiga music editor and format that built notes from synthetic waveforms instead of samples, yielding tiny game music.
Where the MOD format stored recorded instrument samples, Future Composer generated its sounds from simple waveforms and envelopes driven straight through the Paula chip. The price was thinner timbre; the payoff was size — a tune took a few kilobytes instead of hundreds, which made the format popular in games and in the memory-starved demoscene productions on the Amiga in the late 1980s.
Its files are recognised by the FC13 and FC14 signatures. The playroutine was small enough to embed in any program, and support survives in modern players that collect retro game music.