After hearing Sasha Cooke sing Mahler’s Rückert Lieder on August 10, audiences may recognize some themes in tonight’s symphony. The fourth movement, the Adagietto, draws explicitly from the Lieder and is recognized as a love letter from Mahler to his wife, Alma. Leonard Bernstein famously led the New York Philharmonic in a performance of the heartbreakingly beautiful Adagietto at Robert Kennedy’s funeral service in 1968. The rest of the symphony is pretty good, too.