I am interested in cataloguing live musical theater casts but there is no guidance currently in the style guidelines. I suppose it would look something like..
Wonderful Town Cast (Original Broadway production)
members:
Edie Adams - vocals (Eileen Sherwood) (1953-02-25 - 1954-07-03)
…
Wonderful Town Cast (Original London production)
…
Wonderful Town Cast (2003 Broadway revival)
…
These would then be related to their associated theatrical runs as either a tour by relationship (for a touring cast) or, i guess, a residency? for a broadway cast.
Currently the guidelines about casts seem more geared towards releases where ensemble cast artists are discouraged.
However, I think it’s fairly natural to think of an artist as being a member of a Broadway cast in a specific role for a specific period of time.