"Hi ho, hi ho, it's off to work we go ..."
Not to be outdone by cats, here's a dog singing the "Game of Thrones" theme.
On a live episode of This American Life, Joss Whedon played the piano and sang a song from Commentary! The Musical.
(Dr. Horrible's Sing-Along Blog)
"Are those elves singing?"
"Aye, lad. Dorwinion Red Wine does a number on them."
"Yeah, but why does the butler want to be called "Maybe?"