Whoa. Tonight we’re getting treated to a double dose of rock ’n’ roll heavies playing together: Steve Cropper, the guitarist of the famous Stax Records house band Booker T. & the M.G.’s, and Dave Mason, the Traffic and Blind Faith guitarist who also released a string of killer early-’70s hits. This show oughta be a good sing-along time, as the set list looks like a mix of both fellers’ radio hits, including “Green Onions” and “Time Is Tight” by Cropper, and “Feelin’ Alright” and “Only You Know and I Know” by Mason. by Mike Nipper