The new Tom Petty box set An American Treasure won’t hit stores until September 28th, but his team is already thinking about future archival releases. Nothing is definite at the moment, but Heartbreakers guitarist Mike Campbell tells Rolling Stone that the group hopes to release a live set commemorating their 1997 residency at the Fillmore in San Francisco. They played 20 sold-out shows at the historic theater in January and February of that year, radically changing the setlist each night. In 2009, seven songs from the Fillmore run were released on the Live Anthology compilation, but that was just a tiny sampling of their total collection. “For me, that was almost the pinnacle of the band just being totally spontaneous night to night to night,” says Campbell. “We might throw in a Grateful Dead song that we just learned that afternoon. We recorded every show and we had guest artists from Bo Diddley to Roger McGuinn to John Lee Hooker. And I know, in my memory of those 20 nights, there’s an amazing album in there.” MORE