Review by Allan Kozinn in NY Times: Jeffrey Kahane offered glimpses of both the past and a possible future in his performance with the New York Philharmonic at Avery Fisher Hall on Tuesday evening. In the first half of the program he conducted works by Bach and Mozart from the harpsichord, a nod to the practice of the time, and later he was both soloist and conductor in Beethoven’s Piano Concerto No. 1. He played the Beethoven from memory, but for the Mozart, he used an iPad instead of a conventional score. Seeing the device perched on the harpsichord’s music stand called to mind the cover of Wendy Carlos’s “Switched-On Bach” album, on which the bewigged composer stands before a Moog synthesizer, though the iPad is elegantly miniature by comparison.