The 19 Most Epic Glee Performances of All Time

OK, I know that "Loser Like Me" was the first original song released by Glee, and it did land them on the top of the iTunes charts, but "Light Up the World" is so much catchier! Like "Loser Like Me," producer Max Martin — who is known for producing hits for Britney Spears and Katy Perry — teamed up with executive music producer Adam Anders to create this single. It was one of three original songs performed in season two and, frankly, is still my favorite.