The Sound Interface Device (SID) is a sound chip designed by MOS Technology in 1981. It is the "legendary" sound chip used by the [[Commodore 64]].
It was indeed better than the [[AY]] used in many other computers of the era (Amstrad's too) because it could produce many different (3) wave signal signals while AY could only produce rectangular wave signals.
Make your own judgment: [https://youtu.be/_LWbnjvXN4g AY vs SID sound comparison]