Here's one most of you probably recognise; this is J-E-N-O-V-A from Final Fantasy VII. This is also one of the ones we're quite proud of!
This one uses the VRC6 expansion chip. you might know it as the reason Castlevania III's soundtrack sounded so different in Japan (the north american NES doesn't support the sound expansion chips for whatever reason, so the soundtrack was redone)
(here's the official famicom version of it: https://www.youtube.com/watch?v=Q567c0mEEec )