found: His Prelude, nocturne, and dance, c1965:t.p. (Leonard Kastle)
found: Baker's biographical dictionary of twentieth-century classical musicians, c1997(Kastle, Leonard (Gregory); b. Feb. 11, 1929, N.Y.; American composer and pianist)
found: IMDb, June 4, 2009(Leonard Kastle, director, writer, composer)
found: New York times WWW site, May 23, 2011(in obituary published May 21: Leonard Kastle; b. Leonard Gregory Kastle, Feb. 11, 1929, the Bronx; d. Wednesday [May 18, 2011], Westerlo, N.Y., aged 82; opera composer who unexpectedly found a niche in film history as the writer and director of the low-budget 1969 crime-thriller film The honeymoon killers)