The Madison Symphony closes its season May 9-11 with an all-Gershwin program under the baton of John DeMain. The Cuban Overture gets things off to an energetic start, followed by Philippe Bianconi as soloist in the Piano Concert in F major. Soprano Michelle Johnson and baritone Eric Greene will join the Madison Symphony Chorus in Robert Russell Bennett’s arrangement, Porgy and Bess: A Concert of Songs.