Highly influential avant-garde American composer and artist (1912–1992). ALS, one page, lightly-lined, 8.5 x 7, personal letterhead, June 16, 1977. Letter to an admirer. In part: “My congratulations on your age! I am now approaching 65. My next text ends with a story abt. Doris Dennison’s mother who’s in her nineties…The following books of mine are published (& in paperback)…Silence, A Year from Monday, M ….” In fine condition, with a bit of scattered mild toning. Accompanied by the original mailing envelope. RRAuction COA.