About the only thing Metallica has in common with a-ha is that the two bands existed at the same time. They couldn't be further apart in sound and style. Or so we thought.
At Metallica's show in Norway, Kirk Hammett and Robert Trujillo treated fans to an unexpected guitar and bass cover of "Take On Me".
While frontman James Hetfield and drummer Lars Ulrich sat this one out, the crowd in a-ha's home country were really into it.
Reel Big Fish have also covered the 80's classic and ws featured on the soundtrack to the movie BASEketball
What are some great covers you've heard from bands you wouldn't expect to cover those songs?