I'd say 'MIDI music' became a catch-all for music that's represented as data that is in turn triggering samples, rather than being a pure audio file. Might be actual MIDI or might be tracker music etc.
replyA more appropriate term is "chiptunes". I also heard people refer to it as keygen music.
replyIf it's a tracker module of some kind with very short looping samples, then yeah, it's a chiptune.
replyIMHO, a “chiptune” is music for an FM synthesis chip, like on the NES, the SID chip in Commodore 64, or the AdLib sound card for PC. A “mod” or “tracker music” is music made for a range of platforms in a rather narrow time-band, that could play digital samples, but could not reasonably store entire songs recorded digitally, like the Amiga, Atari ST, or early PC’s like 386s or 486s.
replyNeither the NES nor the SID employs FM synthesis. I'm not even sure what the collective noun is for these. Wikipedia tells me it's PSG (programmable sound generator).
replyThe same behavior could be (also was) teased out of a MOD player if you choose samples with a handful of sample points, like 12. You could also draw up a sawtooth in paint and use that as a sample. These are down-to-earth honest true Scotsman chiptunes.
Those are SID etc. tunes. Not chiptunes.
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