*NSYNC did it. So did Alicia Keys, Chris Brown and Destiny's Child. Even the Goo Goo Dolls and Weezer have pushed aside their maturity and adult-like ways for one day and play music with puppets. And now The Shins have joined the mix and played on Nick Jr.'s Yo Gabba Gabba.
Never saw the show, but exactly what are those characters supposed to be?