The New Grove Dictionary of Opera, Macmillan, 1996
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(Orphée et Eurydice; French version, tragedie opera in three acts by Gluck to a libretto by Pierre Louis Moline after Calzabigi; [estreno] Paris, 2 August 1774; Gluck revised in 1774 the opera for performances..., transposing and adapting the role of Orpheus for an haute-contre, also altered the orchestration..., and added vocal and intrumental pieces to make the opera much larger, longer and grander)