This show has been making local classic-rock fans salivate all summer long, but aside from the umpteen songs that might be playing this very minute on the Arrow or the Eagle, it's really the biggest blues blowout the Houston area will probably see all year. Petty & the Heartbreakers' first album in eight years, Mojo, has dashes of reggae, psychedelia and J.J. Cale country shuffles (the irresistible "Candy"), but it's a blues album through and through. Opening with the Sonny Boy Williamson strut of "Jefferson Jericho Blues," Mojo builds to the seething early-Zeppelin fury of "I Should Have Known It" before simmering down to finger-lickin' rural travelogue "U.S. 41," after-hours close-dancer "Lover's Touch" and one of Petty's signature lip-biters, "Something Good Coming." ZZ Top, meanwhile, may not have released any new music since 2003's Mescalero (and, some would say, much longer), but the timeless trio is still at the top of its game live. Reviewing the Texas icons' show at Manhattan's Beacon Theatre last week, The New York Times' Ben Ratliff wrote that "even in a three-minute song, the band members find a groove that could tunnel into eternity. They've got it licked." And how how how how.