Wow, what a story!
Personally, I plan on majoring in Environmental Policy or something of the sort. As a captain, I encourage my kids (I'm also nicknamed Team Mom) to explore all the parts of Robotics-from working on the robot to working on our business plan and other lit. As a freshman, I worked with the robot far more than any business stuff, but now, as a junior, I'm in charge of everything but the robot. For a while, I thought of Environmental Engineering, but since my math and science are somewhat lacking (despite being Chinese, haha), I'm leaning towards other environmental majors. Although I'm not as connected with engineering, I do understand it, and especially as a freshman, was inspired by the things we did.
I also understand your love of music. I'm flute section leader, and I regularly participate in District Bands and other extracurricular bands. I admire your dedication to trumpet, and I think it's awesome that you want to pursue music as your career! I think FIRST does encourage technology, science, and engineering, but at the same time, I think a good part of it is just finding something that you love to do, and from my experiences with FIRST, people will support you whatever you do. From my team, I know that there are budding engineering majors, but also pre-med, and even, I think, a Classics major who happens to be on our build team. I certainly don't think that just because someone works with a robot and loves it means that they have to major in something science/tech/engineering related.
Reading other people's posts...it seems music majors can do anything! For instance, I know one of the admissions people at Wash U in St. Louis majored in music and look what she's doing now
I wish you all the best!
~Hannah
(Incidentally, have you competed in the National Trumpet Competition? One of my best friends also plays trumpet.)