Some most likely asked questions: Can you read music? Are you respectful and polite when dealing with artistic staff, cast, musicians, crew? (Not that you shouldn't be repectful and polite on any type of show--but opera requires this.) Are you extreamly organized? (Opera can not handle "ad libs"/ "stalling for time" well if a singer/prop/quick change etc., isn't there/does't happen exactly on cue.) These are just a few off the top of my head.