The New York Philharmonic gave the local premiere of his 2017 concert work Concerto for Two Pianos, composed expressly for the glamorous piano duo of Katia and Marielle Labèque. Semyon Bychkov was a beacon on the podium, emanating a love for the music. With a floating stance, and the hypnotic assurance of a wizard conjuring a spell, Bychkov extracted luxuriant playing from the musicians, suffusing David Geffen Hall with tidy sumptuousness.