I was playing a lot of Genesis games earlier and I got to thinking about the limitations of the sound chip. Despite the weak sound hardware, I really think that sound contributed a lot to some games, especially shooters.
Among the games I've played in the last few days which I feel benefit the most from this:
Thunder Force IV (pretty popular example of a great genny soundtrack)
Contra: HC (First stage music especially, nice pumped up tunes)
Super Fantasy Zone (fits the wacky mood wonderfullly)
Bio-hazard Battle (great addition to the creepy atmosphere)
Anyone have any favorite examples of games that use the limited sound chip to good effect?