GreeoveShark gets an update to version 2.0 with many new features. With GrooveShark you can stream music in background and this is what Apple doesn’t like much.
Last August Apple relaxed its terms and approved GrooveShark for App Store but pulled it a week later after a complaint by the Universal Music Group UK.
The app is released free under BigBoss Repo in Cydia store but for unlimited access you will have to go to vip.grooveshark.com and sign up for $3/month.