Just when the iPod jingle got out of your head, it's back! Feist stopped by Sesame Street to sing a new version of her song "1 2 3 4" to Elmo & Co. The episode featuring the Canadian songstress will premiere on August 11th, but you can watch the video here. Other celebs who will be stopping by the Street during the 39th season include: Will Arnett, Jessica Alba, David Beckham, Heidi Klum, Neil Patrick......