The Amigas are (mostly) Commodore computers. Maybe you meant Atari, its main competitor. And speaking of music, the Atari ST was also very popular not because o

The Amigas are (mostly) Commodore computers. Maybe you meant Atari, its main competitor. And speaking of music, the Atari ST was also very popular not because of its sound, but because it had built-in, very low latency MIDI. I think they are so popular because so many kids grew up with C64s, it was both a game console and a "serious" computer. So now, they attract both retro-gamers and programmers who learned on these machines. PCs and Macs were mostly work computers, more expensive and mostly for grownups, so less nostalgia, the ZX Spectrum wasn't great IIRC. The Amiga 500 and Atari ST still have a lot of followers, maybe that they had to share the space made them individually less popular than the C64.