I would also say to cast a wide net if doing audition based programs. None of them are safeties. Schools like Juilliard have less than a 1% acceptance rate into the BFA program and many others have about a 5-8% acceptance rate (or less). Just make sure to have a list with a true safety that doesn’t require an audition, that your son can definitely get in academically, go to financially and is willing/excited to attend. 
It can be a hard combo to get. Sounds like your son has great academics…but many kids with top academics (valedictorians for instance) get turned away from schools. It isn’t fun to hear, but better to have some safeties and not need them vs. only applying to the “best” and not having choices. Again, good luck! Sounds like your son is doing great things this summer and will get lots of input from the two programs he is attending.