Dohnanyi’s Sextet was a revelation, full of sumptuously shaded dark moods, yet ending with an atmosphere of giddy high spirits. The music was densely textured for the most part, and the performance was extremely cohesive, driven by a noble, sweeping lyricism. But when the texture became more transparent, we were aware of the sheer beauty of the musicians’ individual sound: Boen’s golden, commanding horn; Alan Chow’s sparkling piano, Barbara Haffner’s soulful cello, Bloom’s smoky clarinet, the mercurial urgency of violinist Yuan Qing-Yu and violist Roger Chase.