Harbison, John. (b. 1938) Autograph Letter SignedAutograph letter signed from the important American composer and conductor, declining a commission from the Williams Trio. October 26, 1981; 1 p. Harbison writes: "Thank you for your inquiry. I know the Williams Trio by reputation and was impressed by the material you included. But I cannot add any committments [sic] to the ones I have already undertaken for the next three years. These include a violin clarinet piano trio, a chorus piece, and most