Theodore S. "Ted" Davis, organist and choirmaster at Baltimore's St. Bartholomew's Episcopal Church, will present a concert on St. Mark's Lutheran Church's Patrick Murphy organ, featuring music of J.S. Bach and including audience participation as part of the program. In addition to being an active organ recitalist, Mr. Davis is also a harpsichordist, chamber music performer, conductor, and composer. He has achieved national recognition in organ-playing competitions. He is currently a doctoral candidate and teaching assistant at the Peabody Conservatory. Free parking available in lot at 20th and St. Paul streets. Free will offering. Reception follows concert.