 They also founded and operated the New York Opera Studio, which trained young singers.Castel annually presented the Nico Castel International Master Singer Competition, which accepted competitors up to age 40.Among Castel's recordings are "Manon" (with Beverly Sills, 1970) and "The Tales of Hoffman" (with Sills and Norman Treigle, 1972), both conducted by Julius Rudel, and a live performance from the Metropolitan Opera of "Ariadne auf Naxos" (1988, with Jessye Norman, Tatiana Troyanos, and Kathleen Battle, conducted by James Levine; issued on DVD).