Pennsylvania Sinfonia Orchestra celebrates its 30th anniversary season in "A Musical Milestone." Juilliard-trained cellist Meta Weiss is guest soloist in Robert Schumann's Concerto for Cello and Orchestra. The program includes a lovely string serenade by Mozart and Haydn's Lord Nelson Mass performed by the Camerata Singers, all under the direction of Maestro Allan Birney. Post-concert reception.