Alter Bridge's fourth album is currently in motion, according to co-founder Mark Tremonti.

The guitarist tells us that the quartet -- which features Creed bandmates Scott Phillips and Brian Marshall and singer Myles Kennedy -- got together in January for the first songwriting session, with plans to reconvene after Tremonti's upcoming U.S. tour to support his solo album "All I Was:"

"We've got about five songs outlined, and all of them are kind of real high-energy, just real fun rock/metal...We want to not be predictable. We want to make it a little surprising, and we're having fun with it. Our plan is to get in the studio sometime in late April with Alter Bridge and record through the summer. And then me and Myles will be doing kind of sporadic little shows here and there...then come back and finish the record."

In addition to Alter Bridge, Kennedy also works as Slash's lead singer. The new album will follow-up 2010's "ABIII."  Tremonti's solo band -- which includes Wolfgang Van Halen on bass -- is currently finishing a European run and starts a short U.S. swing on February 21 in Pontiac, Mich.

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