Radio City Music Hall Rockettes perform after days of rehearsal and routine polished to perfection at the Radio City Music Hall in New York City on July 26, 1949. (Photo by Ivan Dmitri/Getty Images)





Rockette Olga Burke sits at a dressing table in the Rockettes' dressing rooms, and talks to the girls before a show at the Radio City Music Hall in New York City on July 26, 1949. (Photo by Ivan Dmitri/Getty Images)





The Rockettes practicing the kickline during a rehearsal in New York City in 1960. (Photo By Art Rickerby/The LIFE Premium Collection/Getty Images)





The Rockettes performing under spotlights on Radio City Music Hall stage during the Christmas season in New York City in 1964. (Photo by Art Rickerby/Getty Images)





The Rockettes perform onstage at Radio City Music Hall in New York City on December 10, 1967. (Photo by NBC via Getty Images)





The Rockettes dancing on stage, circa 1970. (Photo by Hulton Archive/Getty Images)





The Rockettes perform part of their Christmas show outside Radio City Music Hall in New York City on November 17, 1998. (Photo by Linda Cataffo/Getty Images)





The Rockettes' legs can be seen as the curtain rises on a dress rehearsal of the Radio City Christmas Spectacular show in New York City on November 11, 2009. (Photo by Lucas Jackson/Reuters)





Dancers warm up before the start of auditions on April 30, 2013, at Radio City Music Hall to become a Rockette for the upcoming 2013 production of the Radio City Christmas Spectacular at Radio City Music Hall in New York City. (Photo by Timothy A. Clary/Getty Images)





The Rockettes performing Michael Buble's "Christmas in New York" at Radio City Music Hall in New York City on October 27, 2014. (Photo by NBCU Photo Bank via Getty Images)





The Rockettes rehearse for their 2015 production of Radio City Christmas Spectacular titled "New York at Christmas" during a press preview at St. Paul the Apostle Church on October 15, 2015, in New York City. (Photo by Timothy A. Clary/Getty Images)





The Rockettes perform on stage during the 2015 Radio City Christmas Spectacular Opening Night at Radio City Music Hall on November 18, 2015, in New York City. (Photo by Mike Pont/Getty Images)





The Rockettes perform at the 89th annual Macy's Thanksgiving Day Parade rehearsals on November 24, 2015 in New York City. (Photo by Mike Coppola/Getty Images)





A view from backstage as the Rockettes line up during a song during the 2015 Radio City Christmas Spectacular at Radio City Music Hall in New York City on December 2, 2015. (Photo by Timothy A. Clary/Getty Images)





Backstage as the Rockettes prepare to perform their Rag Dolls number during the 2015 Radio City Christmas Spectacular at Radio City Music Hall in New York City on December 2, 2015. (Photo by Timothy A. Clary/Getty Images)





The Rockettes perform their Rag Dolls number during the 2015 Radio City Christmas Spectacular at Radio City Music Hall in New York City on December 2, 2015. (Photo by Timothy A. Clary/Getty Images)





A view from backstage as the Rockettes perform a number during the 2015 Radio City Christmas Spectacular at Radio City Music Hall on December 2, 2015. (Photo by Timothy A. Clary/Getty Images)