TUAW's Daily App: Glee Karaoke
The app is cheaper than before, too (just US $0.99 for the original purchase). Songs still have to be purchased separately, but every week, Smule is adding new songs into the mix, so you can keep up with the show during the season.
I have to admit, Smule has been pretty innovative with music on the App Store, and this latest app revamp is no exception. For Glee fans, it's a must, but anyone who enjoys belting out their favorite lyrics should definitely check this one out.