Totally agree. SN76489 had a particularly dreamy 8-bit sound (BBC micro also used it AFAIK). Thanks for sharing (never played SMS Ninja Gaiden).
I never know if I would have preferred the music of the Yamaha YM2413 FM chip that was available as an extension to the Mark III and came with the Japanese Master System only.
It does sound great though - Yamaha YM2413:
Texas Instruments SN76489: