all you really need is a bittorrent client (i use
this one).
after you've DLed and installed it you are ready to start downloading music (not to mention tv shows/movies/almost anything else you could possibly want). go to a torrent website like
bootcity,
dimeadozen,
mininova or
demonoid. then search for whatever it is you want. once you find it you will download a .torrent file to your computer. this isn't the actual file(s) you were looking for, it just tells your computer what it needs to DL. open the .torrent file in the program you just installed (bit tornado). a window will pop up asking where you want to save the DL to. pick a folder and then you're good to go.
does that answer your question?