Rocker Adam Levine is amazed he has a new collaboration with hip-hop stars the Ying Yang Twins, because he's never met them.

The MAROON 5 frontman sings the hook on their track LIVE AGAIN, but he admits it was a deal that was firmed up without the parties ever coming face to face - even in the studio.

Levine says, "I love those guys. They're crazy and fresh and interesting. And the s**t that they do is pretty unique.

"To be totally honest with you, I actually didn't meet them. Technically it wasn't so much of a collaboration because the song was written.

"All I needed to do was sing the lyrics that had already been written. I don't know those guys; they seem kind of kooky and crazy. I like their vibe."