Yep, some networks have become kind of specialized on certain files
. For instance, if you want TV series, WinMX is the place to go, although lately you can find a lot on ed2k, too. Ed2k is The Place for movies, full apps and games (because good performance to transfer larger files), but it's not the best for music. Gnutella seems to be pretty good for music, but here you can also try Piolet.