All time great: Jerome Robbins' transition from the fire escape scene ("Tonight"Favourite scene transitions? into the dance at the gym. I'm not even a big fan of WSS (at least compared to its fanatics; I realize it's an important work), but the transition into the gym made me gasp out loud in Robbins' mid-1980s revival (and I was watching from the stage manager's desk in the wings, not from out front).
Oh, boy. Let’s correct some things here: Tony meets Maria AT the dance, so “Tonight” happens afterwards, not before the dance. The transition you meant to say is when Maria is inside the bridal shop (with Anita, Bernardo and Chino) and mentions her excitement for the dance and begins to twirl as the stage goes dark and as other girls twirl on stage alongside her, in a loud pop colored streamers drop from the flies and in a blink the entire stage is engulfed with dancers (the Sharks and the Jets) dancing inside the gym. Also, this revival (which played the Minskoff Theatre) was in 1980, not the mid-80s.