Rubinstein, Anton. (1829–1894) Autograph Letter about Opera LibrettosA long and interesting autograph letter from the great Russian pianist and prolific composer to a female friend (addressed as "Frau Professorin,") sending best wishes from his wife and mentioning his views on appropriate texts for librettos. Responding to the correspondent's suggestion of an opera subject, Rubinstein writes: "The material about Penelope is very nice and would certainly be suitable for working up for the stage, but I personally do not