If you haven't tried out Pandora yet, you're missing out -- it allows me to create personalized streaming "radio stations" with music based on an artist, a song, or a genre.  Then it streams out to my machine any time I want to listen.  Free for now, I assume I'll either pay in the future or it will be supported by selling me the music I listen to.

My list includes Queen, Diana Krall, Dixie Chicks, Mannheim Steamroller and Jimmy Buffett -- but they change daily.  http://feeds.pandora.com/styles/feeds/songs-art-blue.css