Dolphin makes me want to play GameCube games I didn’t even knew existed, just because it makes everything more beautiful, smoother and as fast as the real thing.
Kega Fusion to this day feels as close as the original Mega Drive experience as I ever felt, plus I can easily change region and video output mode and play my games in the specific hardware setup they were imagined for (this is of course coming from a Mega Drive hardware specs nerd)
Either Soulseek (Which still manages to be my one-stop shop for this kind of thing) or forums, but you’d have to find an active forum related to that niche. For example there’s Squidboard for game and anime soundtracks