Alter Bridge, featuring Creed guitarist Mark Tremonti, are working on their fourth studio album, but there's a twist in their approach, at least in terms of one song on the disc. The guitarist has confirmed that he actually sings lead vocals on a new track.

It's refreshing to know that the band is trying new things on the follow-up to 2010's 'AB III.' "When they were working on vocals, [producer] Elvis [Baskette] told me that [singer] Myles [Kennedy] wasn't really connecting with one of the songs and they started talking about me giving it a go," Tremonti told Music Radar. "Elvis said, 'Let's take a negative and give you a chance to take that song that he's not feeling and sing it.' So I wrote it about a fictional apocalypse. Right now, it's called 'The Waters Rise' and I'm glad to be able to have done it."

The guitarist is decades-deep into his career and still continues to surprise himself. Of course fronting his own self-titled band over this past year may have helped with his confidence in singing a track for the group. Above all, he wants the band's legion of dedicated fans to expect some sonic surprises here and there.

Tremonti said, "I think that's one of the main reasons we wanted to do that, to let the fans know that we are doing new things and to expect new things and surprises."