Pianist Alicia de Larrocha, plays her final public concert at Carnegie Hall, and retires. “As departures go, Ms. de Larrocha’s appearance was unusually low-key. Not much had been made of it publicly, although her retirement at 79 was not entirely unexpected. Like any musician who has enjoyed a long career, Ms. de Larrocha has seen performance style, and the tastes that drive it, move through cycles of change and reconsideration. In the Spanish works in her repertory she has remained peerless, but in Mozart, the expansion of the early-music world and the expectations it has created have been challenges for her.”