Our music today will include a newly-acquired recording of Mozart’s Piano Concerto No. 21 from Jonathan Biss and the Orpheus Chamber Orchestra; Stravinsky’s early Symphony in E-flat, Op. 1, conducted by Antal Dorati, who was born on this date; and Beethoven’s String Quartet No. 9, played by the Jasper Quartet, which performs at St. Michael’s College this evening.