Rosalyn Tureck was one of the leading Bach interpreters of her generation, and a celebrated keyboardist who also embraced contemporary music, making her Carnegie Hall debut not on the piano or the harpsichord, for which she would become so well known later, but on the strange and eery electronic instrument known as the theremin. Brash and opinionated, she once snapped to a colleague, “You play it your way; I play it Bach’s way.” She passed away at her New York home this weekend, at the age of 88.