“The piano is a percussion instrument.” So say my notes from midway through Kariné Poghosyan’s all-Khachaturian recital at Carnegie Hall’s Weill Recital Hall. Certainly it was in Poghosyan’s hands, and she both reaped the rewards and did not entirely skirt the pitfalls of such an approach. The program, consisting of works written for the piano or arranged for it from orchestral originals, showcased both Khachaturian’s dramatic side and a more lyrical strain. The former fared very well indeed here, the latter somewhat less so.