This accomplished vocalist, guitarist and singer-songwriter from Mississippi rocks Charleston once more on his "Summer Solo" tour. Mars' floating, mellow croon combined with sensual-rock arrangements has been compared to singers such as Jason Mraz and Josh Rouse and has been called a tougher edged version of Jeff Buckley. As a firm believer in the hypothesis that the good stuff sticks, he says songs come to him spontaneously and he relies on the quality and the memorability of the material to remember it. The Circular Congregation Church, 150 Meeting St. $15; $20 advance. (800)514-3849.