Even by Mozart’s standards, the composer’s Clarinet Concerto, K. 622, is a singularly blissful work. And even by Mahler’s, his Sixth Symphony is singularly shattering—literally so, in that it builds to two (or, depending on the edition, three) pulverizing blows of a Bunyanesque hammer. Martin Fröst, the Swedish soloist in the Mozart, spins out as soulful a legato as one could wish for. As for the bona fides of the 30-something Israeli maestro Lahav Shani, it’s worth noting that his career got a big boost with his win at the 2013 edition of the triennial Gustav Mahler Conducting Competition in Bamberg, Germany. The repertoire on that occasion included the two central movements from the Sixth. —Matthew Gurewitsch