@beardalaxy It's pretty much just an old-school P2P program that survived all the way to the modern day. By far the most active of those that are still around. You can find almost anything music-related on it. My current music setup is just Soulseek for finding albums, WACUP (fork of Winamp made by one of the original developers) for playing the files and WACUP's built-in
last.fm support for statistics. It works quite well for me.