A summer concert featuring St. Mary’s College of Maryland pianists Brian Ganz and Beverly Babcock will begin at 8 p.m. Thursday, Aug. 18, at the college’s Auerbach Auditorium in St. Mary’s Hall. The main work will be Beethoven’s Piano Concerto No. 1 in C major; there also will be works by Maurice Ravel and Franz Liszt, and the Brahms Waltzes for piano (four hands). The free concert is open to the public.