The Commodore 64 with its famous SIDchip really blew everyone away when it was introduced back in 1982.
It could play 3 different sounds at once, but during the years musicians and programmers learned to drop sounds in and out during the course of the music so it gave the impression that there was more than 3 different sounds playing at the same time.
The two different original SID chips, the 6581 and the 8580 have some differences in sound and capabilities, and there's always discussions going on about which sounds the best. I'm no SID purist, I'm a musician first and I've grown to appreciate the 8580 as the main SID source when I use the C64 in my music. I do prefer the 6581 for games and that one is also necessary for certain games to sound correct.

The original version of the Golden Boy can be found here:
https://bit.ly/37rG4gE
The two different C64 versions can be found here:
https://bit.ly/2NczdzP

Information about the Mssiah can be found here:
https://www.mssiah.com/

https://espenkraft.bandcamp.com/