I used Atari 1040STs in school with Notator (I am a muso). It was the only way to do it back in the early 90s. That connected to Korg 01s/M1s, Yamaha SY77s. Ah, the memories. The Amigas at my school were used for animation/ray tracing exclusively at the time.
That's awesome your school had such diverse computers! But, Amiga could be just as MIDI "ready" with a $40 parallel port MIDI box. And there's plenty of music/MIDI capable software written for the Amiga as well.
Funny how a few musicians gravitated toward the Atari line just because MIDI was built-in. BTW: I've known musicians that have used ST's before. Guess what? They could care less and knew nothing about the computer as a whole. It was nothing more than just a bridge or an appliance of sorts for them. Never used their computers for anything else.
Same is true with a friend that owns an embroidery/screen printing shop here in town. Used a MegaST for years before he went PeeCee. Only ever used his ST for the one "simple" process of laying out patterns to be scanned in and printed. Nothing else. Veird!
@Dentunes: yeah, I have an iPad. There's a few stupid aspects about it I don't like, but all things considered - it's pretty neat for what it is.