Great thread: In case anyone cares; FM Synthesis was done on the Amiga, at least for one app. that I know of... something by The Other Guys' software, who made the hideously expensive Sample Wrench. And as mentioned, it was quite processor intensive... I know it was way pre-AGA.
I was going to mention that the Amiga version of Aladdin has the theme song actually sung.... but it's probably just on the AGA version