This was banned after parents complained that preschoolers, not too far beyond the suckling stage, may be irreparably harmed by seeing Katy Perry's cleavage. needless to say, it has since had 54 million YouTube views.
But wait, Ricky Gervais isn't a musician. Oh, how wrong you are! He was actually in a new wave band back in the 80s. Anyway, this combines his musical skills with his faux-arrogant comedic persona and a chorus that every kid in the world will love.