It's a Common Mistake

Scene: The boys and I, in the car, listening the radio.

Son #2: What song is this?
Me: Gone, Daddy, Gone.
Son #2: Who sings it?
Me: Gnarls Barkley
Son #1: Have we heard this before?
Me: It's a cover. The original is by the Violent Femmes.
Son #1: The Violent Phlegm???