I think he did a pretty commendable job on the beginning of Impossible Year before he took the song into his upper register and made it his own thing.

Jon…. you were supposed to be our warm familiar fuzzy blanket to help us get through this new post Colbert Report era….. It's a scary place but we were comforted knowing that we had you there….. DAMN YOU JON! TOO SOON! TOO SOON!