Let's see... I've never heard him sing 'If we Hold on Together'. I don't think he sings Eggs, or stand tough, or when your big, or grandmas lullabye, or who needs you, or very important creature, or the mad song, or Bestest Friends, or Girls and Dads, or Things Change, and that's as far as I can go. I might be wrong about the ones from the third movie.
One of the gang should technically be a carnivore, but is presented as an herbivore.