found: His Syzygy, 1966.
found: New Grove dict. of Amer. mus.(Del Tredici, David (Walter); b. Mar. 16, 1937, Cloverdale, CA; composer)
found: History lessons, 2000:credits (David Del Tredici)
found: IMDb, June 4, 2008(David Del Tredici; b. March 16, 1937 in Cloverdale, California; musician and actor)
found: Wikipedia, March 3, 2015(David Del Tredici; American composer; "pioneer" of the Neo-Romantic movement; openly gay)
found: David Del Tredici website, March 3, 2015:bio ("With the appearance in 1976 of Final Alice--David Del Tredici's hour-long setting of Lewis Carroll for high soprano and large orchestra--a new movement in music, Neo-Romanticism, was born ... In Del Tredici's Post-Alice world, he has taken a startlingly different tack--to create a body of music that celebrates his own gay sexuality. ... has been, for more than 25 years, Distinguished Professor of Music at The City College of New York. He lives in Manhattan's West Village with his mate, photographer, blogger, biker Angellos Malefakis) - http://www.daviddeltredici.com/bio.php
found: The Italian American experience, 2000:page 141 (David Del Tredici (b. 1937))
found: Washington post WWW site, viewed November 28, 2023(in obituary dated November 21, 2023: David Del Tredici, a Pulitzer Prize-winning composer who rejected the cerebral atonality of the mid-century avant-garde to write in a lush, melodious style, died Nov. 18 at his home in the Greenwich Village neighborhood of Manhattan. He was 86. David Walter Del Tredici was born in Cloverdale, Calif., on March 16, 1937)