Here are some classic photos of the original cast rehearsing and performing the show at the Public Theater Off-Broadway and at the Shubert Theatre on Broadway, along with several photos from private collections that have never before been published. Special thanks to original cast member Chuck Cissel and to Barbara Walsh, sister of another original cast member, the late Thommie Walsh, for sharing these photos with Playbill.com.

Members of the original cast at the recording session for the original cast album.

In the rehearsal hall where the show was hammered into shape.

Another view of the rehearsal hall where the show was hammered into shape.

Chuck Cissel in his dressing room at the Shubert Theatre, 1975.

At a reunion of the original cast.

Kelly Bishop (center) in the scene where she first speaks to the director.

The conclusion of "I Hope It Get It," asking, "Am I my resume?"

Hundreds of ACL alumni applaud director-choreographer Michael Bennett at the special performance in 1983 when the show became the longest-running in Broadway history.

Rehearsing "One."

Members of the original cast attend the 2001 Paper Mill Playhouse production.

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As the original "Bobbie," Thommie Walsh explains how he would break into people's houses, not to steal anything, but just to rearrange the furniture.

One of the "groups of four" rehearsing the ballet combination in the opening scene.

In costume for "One," male members of the original cast who got eliminated in the opening scene (and then functioned as swings and understudies). From left to right: John Mineo, Scott Allen, Michael Serrechia, Chuck Cissel and Brandt Edwards.

Resume photo for original cast member Thommie Walsh.

Ron Kulman and Thommie Walsh rehearse the bows combination.

Classic photo of Michael Bennett rehearsing the original cast at the Public Theater.

Sir Laurence Olivier (center) toes the line during a private visit with the original cast.

Donna McKechnie and Thommie Walsh.

*See even more pics here!