Liebesfreud announces collaboration with Philadelphia Orchestra Principal Clarinet, Ricardo Morales in Mozart's Quintet for Clarinet and Strings K.581. An all-Mozart program, on January 27, 2006 - the 250th anniversary of the birth of Wolfgang Amadeus Mozart, opens with the String Quartet in G major K.387. The concert, at the Chambers-Wylie Cathedral on South Broad Street in Philadelphia, begins at 5:30 pm. Admission is free.