mininova.org
limewire.com
Itunes (for older stuff and videos)
kintex (videos)
or i just search for torrents etc...
personally I havent bought a CD in probably 4 years doubt i will, like sirius, or XM I wont get that crap unless I start over the road again, thats the only thing its good for.
Why pay for Radio if you can get it for free?
napster I guess made a come back, but to be honest i just use torrents.