Billy Joel
There's always magic when Billy Joel stands in front of a piano and does his thing. Only Oscar the Grouch can be grouchy after a performance like this. C'mon, Oscar, we know you're supposed to be grouchy but you have to show the piano man some love!
R.E.M.
Sesame Street really went all out with R.E.M.'s Shiny Happy People (or in this case Happy Furry Monsters) and even got a muppet Kate Pierson to sing with the band. This R.E.M. track has always been a fun track and the band jumping around with the muppets just makes this a genuinely enjoyable watch.
The Goo Goo Dolls
You know you've made it when you're asked to sing one of your songs with Elmo. The Goo Goo Dolls should be proud.
Jason Mraz
See above but replace The Goo Goo Dolls with Jason Mraz. Seriously, there's no bigger honor than this.
James Taylor
James Taylor singing Your Smiling Face to Oscar is all kinds of ironic. But strangely enough, this is probably one of the best renditions of Taylor's hit song you can find anywhere. We also have to recognize his band because they were absolutely on point.
Norah Jones
Norah Jones can sing about anything and will still sound great. Here she is singing about the letter Y of all things and it still feels like we went through a thousand heartbreaks listening to her sing.
Andrea Bocelli
We would give up a fortune to have Andrea Bocelli sing a lullaby to us every single night. We love Elmo but we're absolutely green with envy while watching this clip.