Roles in theatre
the person who designs the dance movements
Choreographer
Actor's Right
Stage Right
A song, usually, simple, sentimental, slow, and narrative
a period of rest between acts of an opera or show in which the house lights are raised and the audience is free to move about.
Intermission
the person who writes the score (the melodies / notes)
Composer
Actor's Left
Stage Left
high female voice
Soprano
a rehearsal in full costume
Dress Rehearsal
Group of dancers and/or singers that help carry the story
Ensemble/Chorus
Middle of stage
Centerstage
the speed of the music
tempo
Potential actors are asked to come back after initial round of auditions
Call-back
a person who is responsible for finding the financial backers, making the programming decisions, assembling the performance forces, etc., for a musical.
Producer
Towards the audience
Downstage
singing without instrumental accompaniment
a cappella
First Night of a production
Opening Night
A member of the company of a musical who understudies one of the leads and is also in the chorus, but doesn't have a character name in the chorus.
Away from audience
Upstage
a song in which the text is declaimed very rapidly
Patter Song
a separate instrumental number played at the beginning of an opera or show. In musical theater, it is common for the overture to contain melodies from various songs in the show. The overture is generally a signal to the audience that the show is about to begin.
Overture