Pianist and Nashville Symphony English horn player Roger Wiesmeyer plays a lot of concerts, so we take notice when he calls the Mozart Birthday Benefit Concert at Edgehill United Methodist his favorite show of the year. The annual celebration, now in its 10th year, always draws a diverse crowd of activists and music lovers — founder and organizer Wiesmeyer calls it “an opportunity to marry the things that matter most to me: beautiful music and social justice.” Conductor Joseph Lee will lead a specially assembled orchestra Monday night in Mozart’s “Little” G-minor Symphony No. 25 and the “Gran Partita” Serenade for winds. Always exuberant Vanderbilt composer Michael Rose offers halftime commentary drawn from his recent book Audible Signs, and be sure to stay after the performance for cake and conversation. This year’s concert benefits Nashville Peacemakers, a youth outreach organization founded by Clemmie Greenlee, the Scene’s 2007 Nashvillian of the Year.