Grooveshark is similar to other music sharing services like Rhapsody and emusic, but differs in that there is no monthly subscription.  You download the Grooveshark app (cleverly named SharkByte), and tell it where your music is.  Your music is uploaded to the Grooveshark server for sharing with other users.  You don’t have to specify your main music folder if you don’t want to share everything…just create a new folder solely for Grooveshark.  As long as the SharkByte app is open, you can stream as much music as you want through the Grooveshark website.

If you want to buy the music you’re listening to, Grooveshark has a flat rate of 99 cents per song.  Every once in a while, they have 29 cent download days.