Top 10 Celeb Reactions to Glee Covers of Their Songs

These "Glee" covers made it all the way to their original sings. For this list, we’ll be looking at the best responses musicians had to “Glee’s” renditions of their songs! Our countdown includes Lady Gaga, Slash, Ke$ha, and more! What's YOUR favorite "Glee" cover? Let us know in the comments!