What do you need in a musical?

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There are many people needed to make a musical, different people for different jobs, for example, technicians, technicians purpose is for controlling the sound desk and checking if everything is working, like the speakers or microphones they also control lights(change lights to different colours or put the spotlight on the actors). Costume designers and hairdressers are also very important when it comes to a play, they help out the actors look like the desired aesthetic the directors are going for. And of course, the play wouldn't be complete without the actors, the actors have to memorise they're script and do warmups with their voice before the show starts.