"I'll say, loosely, I've started a blues album," says Walsh of the record that mixes originals with "real obscure R&B and blues songs. Half of it is original, and half of it's old Howlin' Wolf or John Lee Hooker.

"I told everybody to bring a song in and everybody did, be it an old blues song or some idea. We went through some old Stax records from, like, the Otis Redding days, Sam & Dave stuff that were just albums tracks, and did our version of a whole bunch of stuff."