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The Black Swan
1946 Gian Carlo Menotti
This is an aria from the opera The Medium by Italian composer Gian Carlo Menotti (1911-2007, music and libretto).
Opened on 1947 at Ethel Barrymore Theater on Broadway, The Medium was made into a motion picture in 1951, won a price at the Film Festival of Cannes in 1952, and had a nominee for the Oscar Price in 1953, category "Best scoring of a musical picture".

Synopsis of The Medium.
Madam Flora, her daughter Monica and Toby, the mute servant boy, prepare their shabby apartment with tricks to be used during the evening's seance. Mr and Mrs Gobineau arrive, regular clients, and Mrs Nolan, a widow coming for the first time. During the seance Mrs Nolan recognizes her dead daughter, but Madame Flora becomes hysterical when a cold hand seems to touch her throat; she suspects Toby, but he cannot answer her accusations. In an effort to calm Flora's drunken rage toward Toby, Monica sings her the dark lullaby "The Black Swan". In the end, Madame Flora, after drinking heavily, shoots Toby in the dark, killing him.
From OpAnon.

Biography of Giancarlo Menotti on the Schirmer Music Publisher site.
Another biography of Giancarlo Menotti on the Kennedy Center site.

Recording sessions
1963 April 12: New York Carnegie Hall
The sun is falling and it lies in blood
The moon is weaving bandages of gold
O Black Swan where oh where is my lover now
1963 July 4: Newport (US-RI) 9th Jazz Festival