I usually use KDX Client connected to a private server full of mp3's from any genre. I believe we almost have a terrabite of music. We have been up since 1997. Membership is hard to get in since we don't really like leechers and goes by trial by trial application. It's like a community in there since we all help one another. Another option that I use is bittorent and IRC channels. The best is IRC since most of the new stuff is released from there.
DC++ for albums and movies. BitTorrent for movies and TV Shows, and sometimes albums too. LimeWire Pro for random songs and ocasionally TV Shows/music videos.