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AY is the nickname of the AY-3-8910 programmable sound generator family. The Amstrad CPC sound processor is more exactly the AY-3-8912. 

[[MSX]], [[ZX Spectrum]], [[Atari]]... all used Chips from this family (sometimes the YM variant instead of AY...) As a result it is still quite popular in the actual Chip Tuning Tune movement as a vintage sound processor.

Many Chip Tuning Tune sites include AY files and scene.

HalasAlas, the [[ZX Spectrum]] is more often used as reference. But a huge library is available.