Liebesfreud ushers in Mozart's 250th (for those of you rising fashionably late!) at about 9:30 a.m. Friday. Radio station WRTI (90.1 FM) hosts the quartet, joined by the peerless Principal Clarinet of the Philadelphia Orchestra, Ricardo Morales, in the exuberant Finale of Mozart's Clarinet Quintet. Catch the whole program at 5:30 Friday evening. (See Calendar page) Admission is free.