Professional jazz musicians Helen Sung (piano), Marcus Strickland (tenor sax), Mark Gross (alto sax), Josh Ginsburg (bass), and Hans Schuman (drums) showed up at Chandler Music Hall Thursday to interact with Randolph middle schoolers in the jazz band. The clinic pulled the students into a discussion about jazz and all its influences with several musical interludes as the pros would spontaneously burst into song. (Herald / Tim Calabro)