The Rolling Stones re-captured the "top-grossing tour ever" mantle from U2 with the Stones' $437 million A Bigger Bang trek, and tour producer Michael Cohl indicates they may pad that record.

Since the fall of 2005, the band has grossed a staggering $437 million and drawn 3.5 million people to 113 shows, according to Billboard Boxscore. In addition, an estimated crowd of 2 million saw the band perform at Copacabana Beach in Rio de Janeiro back in February. The tour, like every Stones trek since 1989, is produced by Cohl under the Concert Productions International banner, with Live Nation.

Though nothing's official, it appears likey the band will stretch the tour to into 2007, making the $500 million mark easily within reach. "I don't think we're done," Cohl tells "There are still a lot of cancellations in Europe that the band the band feel obligated to try and make up. So I wouldn't be surprised if it keeps going next year."

A Bigger Bang was not without it's drama, including brain surgery for Keith Richards, rehab for Ron Wood, and some vocal stress for Mick Jagger. "Definetly there was drama and hurdles, but at the end of the day, if you tour long enough, everything's gonna happen, isn't it?," Cohl says. "We had to reschedule a couple here and there, but other than the ones in early summer in Europe, which we couldn't make up, we played everything. And they were great."

A highlight of the tour were November performances at New York's Beacon Theatre that were filmed by famed director Martin Scorcese for an upcoming feature film. The theater shows came after the Stones had played nothing but stadiiums for some seven months. "Talk about a shock to the system. On the other hand, talk about exciting," says Cohl, adding that the final Scorcese product should be special.

"Look forward to it," Cohl says. "The setlist is dramatically different than anything you've seen from the Rolling Stones for a long, long time. There are bunch of songs that you've never seen them do, or that they haven't done in 25 or 30 years. Add Martin Scorcese's bent to it and you're going to get something really unique."