Love and loss are at the center this poignant chamber music program presented by Chameleon Arts Ensemble, with extraordinary works that arose from tragedy. The concert includes Schubert’s ode to Beethoven, Auf dem Strom for soprano, French horn, and piano; George Crumb’s exquisite meditation on the nature of life and death, Apparition for soprano and piano; Maurice Ravel’s Le Tombeau de Couperin for wind quintet; George Rochberg’s Contra Mortem et Tempus for flute, clarinet, violin, and piano; and Louis Vierne’s epic c minor Piano Quintet, Op. 42, a rarely-heard, late-Romantic masterpiece written in response to the death of his son in World War I.