Pictured: A contact sheet showing director Hal Prince and actors auditioning for the stage production “Merrily We Roll Along” (1980).

A ballet enthusiast, Martha Swope aspired to a career as a dancer. But an invitation by choreographer Jerome Robbins to bring a camera to rehearsals for the Broadway musical “West Side Story” in 1957 would put her career on a different trajectory.

Choreographer Jerome Robbins (foreground) directs chorus members during a rehearsal of “West Side Story” (1957).

Chita Rivera and dancers are pictured during rehearsals for the musical “West Side Story” (1957).

After one of Swope’s “West Side Story” photos was published in Life magazine, the former ballet dancer focused on a new vocation.

Choreographer George Balanchine (fourth from right), composer Igor Stravinsky (third from right), with friend Lucy Davidova (second from right) attend a rehearsal of the New York City Ballet production of “Agon” (1957). In foreground is dancer Francis Russell.

Allegra Kent, rehearsing the New York City Ballet’s production of “Afternoon of a Faun” (1958). Choreography by Jerome Robbins.

Martha Swope became an official photographer for the New York City Ballet and for Martha Graham’s company, going into rehearsal studios and on stage to capture the ephemeral artistry, grace, sweat, toil and radiance of dance.

The New York City Ballet production of “Swan Lake,” with Allegra Kent (1958). Choreography by George Balanchine.

George Balanchine and Violette Verdy rehearse, as three other dancers look on, in this photo from the 1960s.

The New York City Ballet production of “Raymonda Variations” (1964), featuring Andre Prokovsky. Choreography by George Balanchine.

George Balanchine rehearses members of the New York City Ballet Company for “Apollo” (1965).

Suzanne Farrell and Arthur Mitchell, in the New York City Ballet production of “Agon,” with choreography by George Balanchine (1965).

Choreographer George Balanchine works with New York City Ballet dancers Robert Rodham and Sara Leland during a rehearsal for “Apollo” (1965).

“I always loved photographing rehearsals because it is during that process that real creativity occurs,” Swope said in 2012.

Renee Estopinal performs in the New York City Ballet production of “Apollo” (1969). Choreography by George Balanchine.

A studio portrait of Gloria Govrin from the New York City Ballet production of George Balanchine’s “The Nutcracker” (1965).

Dance 3, looks 10:  A horse is ridden into the rehearsal studio by George Balanchine, for the ballet “Don Quixote” (1965).

Choreographer Merce Cunningham is photographed at a rehearsal of his 1966 work “Summerspace.” In the background are Carol Sumner, Sara Leland, Patricia Neary, Kay Mazzo, Anthony Blum and Deni Lamont.

Merce Cunningham and Patricia Neary rehearse “Summerspace” (1966).

George Balanchine and Patricia McBride, during a rehearsal for the New York City Ballet production of “Glinkaiana” (1967).

David Cryer, in the role of Edward Rutledge, with other cast members from the Broadway musical “1776” (1969).

Patricia McBride and Jacques d’Amboise rehearse for the New York City Ballet production of “Who Cares?” with choreography by George Balanchine (1970).

Actress Martha Henry in a scene from the Repertory Theatre of Lincoln Center production of “Antigone” (1971).

Patricia McBride performs in the New York City Ballet production of “Scenes de Ballet,” featuring choreography by John Taras (1972).

The New York City Ballet production of “Dybbuk” (1974), with Patricia McBride and Helgi Tomasson. Choreography by Jerome Robbins.

The New York City Ballet production of “Dybbuk” (1974), with Patricia McBride and Helgi Tomasson. Choreography by Jerome Robbins.

Barry Nelson, Liza Minnelli and Arnold Soboloff in a scene from the Broadway musical “The Act” (1977).

Mikhail Baryshnikov rehearses George Balanchine’s “Stars and Stripes” (1978).

Actor Raul Julia is pictured on the monochromatic set of Edward Gorey in the Broadway play “Dracula” (1978).

From left: Armelia McQueen, Nell Carter, Charlaine Woodard and Ken Page in a scene from the Broadway musical “Ain’t Misbehavin” (1978).

Heather Watts and Mikhail Baryshnikov, in the New York City Ballet production of “Apollo,” with choreography by George Balanchine (1979).

Al Pacino in a scene from the Broadway revival of Shakespeare’s “Richard III” (1979).

Director Harold Prince rehearses Patti LuPone for the Broadway musical “Evita” (1979).

Mandy Patinkin as Che Guevera and Patti LuPone as Eva Peron in a scene from the Broadway musical “Evita” (1979).

Composer Elizabeth Swados and actress Meryl Streep share the stage with a flamingo, on the set of the New York Shakespeare Festival’s production of “Alice in Concert” (1980).

A scene from the Broadway musical “42nd Street” (1980).

Lauren Bacall and cast in rehearsal for the musical, “Woman of the Year” (1981).

Choreographer Gillian Lynne puts dancers through their paces in rehearsal for the stage production “Cats” (1982).

Cynthia Onrubia as Victoria, in a scene from the Broadway musical “Cats” (1982).

Anita Morris as Carla in a scene from the Broadway musical “Nine” (1982).

Shirley MacLaine in a scene from her show “Shirley MacLaine on Broadway” (1984).

The New York City Ballet production of “Swan Lake” featuring Maria Calegari, with choreography by George Balanchine (1984).

Matthew Broderick and Bill Sadler in rehearsal for the Neil SImon comedy “Biloxi Blues” (1985). 

Bernadette Peters and Christopher D’Amboise from the Broadway musical “Song and Dance” (1985).

June Stein and John Turturro in “Danny and the Deep Blue Sea” (1984).

Marshall W. Mason directs actors Joan Allen and John Malkovich for the Broadway play “Burn This” by Lanford Wilson (1987).

Honoree Martha Swope attends the 2004 Tony Honors for Excellence In Theatre luncheon at Tavern on the Green October 26, 2004 in New York City.

The New York Times reported that Martha Swope died on Thursday, January 12, 2017. She was 88.

By CBS News.com senior producer David Morgan