Is Jack Black the actor in Verizon commercial where he sings The Ace of Spades?

That's a good guess, but it's not Jack Black in the Verizon commercial singing "Ace of Spades"!

The actor in that commercial is Jim Breuer. He's known for his stand-up comedy and for playing "Goat Boy" on "Saturday Night Live". He does a pretty good job of channeling the spirit of Lemmy Kilmister!