Impressive RP2A03 (NES/FC/FDS) & Audio Expansions Music
This YT video series by explod2A03 explains in detail how composers used certain techniques to get the most out of the sound chip. A lot of these were used on other sound chips as well.
Top 50 VGM
Journey to Silius Robocop 3 Overlord/Supremacy Silver Surfer Solstice
The Smurfs Pictionary TMNT, TMNT 2, TMNT 3 Asterix (added stereo) Erik the Viking (unreleased)