As you've probably guessed, Karaoke Revolution Glee is comprised of music from the popular TV series Glee. There are almost 30 songs, including two of Glee's popular mash-ups, "Don't Stand So Close To Me/Young Girl" and "Hair/Crazy in Love." Other popular Glee songs available are "Bust a Move," "Endless Love," "Papa Don't Preach," and "Sweet Caroline." The one complaint that I have on the music is that they use most of the older music when there are so many more current songs featured on Glee. I really expected to see "Single Lady" given that it was the focus of pretty much an entire episode and played so many times! But I guess it couldn't be licensed. All of the music is sung as it was in the Glee episode and is sung by the Glee cast, not the original artists.
The videos in Karaoke Revolution Glee make it the best Karaoke Revolution graphically by far. You don't get to choose a character to play as. Instead, there is a video playing in the background. All the videos are from actual Glee episodes and are quite well chosen. The one problem with it is that you'll find yourself missing lines as you're too busy watching the videos and will get distracted from singing.