That changes the calculus because Temple Honors really adds to the experience and guarantees 4 year of (nice) housing, which matters in North Philly. If in addition the costs are not in the 40-50k range then I’d cross it out.
Yes but the Business&Engineering major has virtually no space for a minor: there’s no elective possible freshman year, only one Spring Quarter Sophomore year (none Fall or Winter), perhaps 2 junior year.
DC has too many concerts by the best musicians for anyone to attend them all 
and I’m sure there are some on campus too.
Here’s what they say on their webpage, but your child could email to have more information :
And AFAIK the music minor doesn’t require an audition though the performing ensembles do. You may want to check whether these are open to non music majors (at AU and elsewhere).