La sonnambula (The Sleepwalker) is a ballet by New York City Ballet co-founder and balletmaster, George Balanchine, made to Vittorio Rieti's music using themes from the operas of Vincenzo Bellini including La Sonnambula, Norma, I Puritani, and I Capuleti e i Montecchi (1830–35) and costumes by Karinska. The premiere took place with the Ballet Russe de Monte Carlo on Wednesday, February 27, 1946, at City Center of Music and Drama, New York; the City Ballet premiere was January 6, 1965.
Winter 2008 NYCB 
Spring 2008 NYCB 
- Playbill, New York City Ballet Friday, June 20, 2008
- Repertory Week, New York City Ballet, Spring Season, 2008 repertory, week 8
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