The Beatles are awesome for the fraggles in general, but I was thinking, "let it be," for either Boober or Wembley? Despite Boober as pessimistic attitude I think that it would be a good song for him, because in a time of genuine crisis, he can cope very well and tell others to be calm, and Wembley seem like a good fit because it's such a hopeful song and he's an eternal optimist. Plus both of their voices would be good with it.