Musical A card is the first actor, and B card is the substitute actor (opposite to the main card of A corner), and B card takes the place of A corner in special circumstances. In most musicals, AB cards will be set up. When A cards can't go on stage due to unexpected situations such as physical reasons, B cards will replace A cards to perform on stage.

A role can have multiple understudies, and an understudy can also substitute multiple roles in different times according to his ability. In some small-scale production tours, parallel cards with similar number of appearances are also common, that is, multiple cards in the same angle alternate performances, without deliberately emphasizing the ab angle.

common sense of musical terms

1. Cass/Card =cast, that is, the cast list, is usually released before the official invoicing/opening, and sometimes it changes temporarily.

2. sd=stage doo, which is the channel for cast members. Before and after watching the live performance, sd can be blocked to feed various favorite actors, take photos, hug and ask for signatures to send gifts.

3. Encore= After the curtain call, the actors with strong voices from the audience will return to the stage to perform one or two encore tracks (usually prepared in advance), which often makes the warm atmosphere in the theater reach its peak.

4. EGOT Grand Slam = a rare all-round performing artist who won Emmy Award (TV), Grammy Award (Music), Oscar Award (Film) and Tony Award (Drama) at the same time.

5. Official photography: Musical video legally shot with official authorization, with excellent sound quality and visual angle, usually used for dvd release and official screening.