It depends on the school. Some (BW and Ithaca spring to mind) have an early audition, and then you find out if you are in, out, or “held” through RD round. Though Ithaca’s may be a true ED- not sure. Anyway- some schools dribble out early acceptances, but many/most make you wait through the whole audition season. Which makes sense when you think about it- if you are only taking 20 people wouldn’t you want to see everyone before you picked your 20?