@robmandu And at one time, vinyl was more popular than MP3.
@baxter Frostwire uses Gnutella, so therefore it isn’t worth crap IMO; read on to see why.
Personally, I am fond of the eMule/eDonkey network. The eMule Plus client is nice and n00b-friendly, though I personally use MLDonkey with the Sancho front-end since it is a multi-network client (including BitTorrent) but the configuration of it is not for the faint-of-heart.
When I was stupider, I used to use Limewire, which used the Gnutella network. However, most of what I looked for wasn’t there or only had a couple of usable sources and much of what it found was fakes or malware. When I tried a multi-network client, I managed to find almost everything I looked for and I noticed that most of the hits were on eDonkey; very few on Gnutella.