Which term is used in musicals to refer to the act or scene that immediately follows another?

The term "segue" refers to a smooth transition from one scene or musical number to another, typically without a pause. In the context of musicals, a segue can be used to maintain the flow of the performance, allowing the audience to stay engaged as the narrative or music shifts. This term emphasizes the seamless nature of the transition, highlighting how one part leads naturally into the next.

In contrast, "transition" might imply a more general change between scenes but does not specifically denote the smoothness expected in a musical context. "Interlude" often refers to a short performance or piece of music that occurs between major sections or acts. "Interval," on the other hand, typically denotes a break or pause between acts or scenes in a theatre production, rather than a scene that follows another.