He performed several songs on the show, including:
* "Forget You" (Cee Lo Green) - In the episode "Theatricality"
* "The Music Man" (Meredith Willson) - In the episode "Theatricality"
* "Don't Stop Believin'" (Journey) - In the episode "The Power of Madonna"
* "Anything Goes" (Cole Porter) - In the episode "Glee, Actually"
While he might not have been a regular cast member, his appearances were notable and his musical contributions were well-received by fans.