One more thing-I never heard anyone say that CalTech and MIT are collaborative environments. Maybe there aren’t gunner types attending, but those places are absolute pressure cookers. There is a reason why MIT doesn’t give letter grades first semester freshman year and CalTech has their take home exam policy.
Look to apply to a less STEM focused school. It’s ultimately your choice, but I think that you’re better suited to a more comprehensive university. Vanderbilt has a good music program and that’s where your ECs are for the most part. I think it’s a better fit and will be less stressful in the long run. Rochester might be a good fit as well.