I think someone had help with this one

Thing One singing to himself to the tune of Simon & Garfunkel's "The Sound of Silence": Hello kitty, my old friend. You come to BLAH on us again.

Singing

Thing Two likes to sing, even though the words escape him. He sings the alphabet song with the good pitch:

"A B D B D B D. D B D B D B D ..."

The orchestral theme from The Phantom Menace (the one where Darth Maul fights with his lightsaber):

"Ha ba da. Ha ba da. Ha ba da. Ha ba da."

Most recently, Baa Baa Black Sheep. And of course the Imperial March and the Star Wars theme, sung in "dun"s.