Our school’s music teacher went to Macalaster. He has a very rich musical life, playing in the regional orchestra, teaching in the school and privately (violin), and playing in a successful indie Rock/cabaret band. After a few years of teaching, he went to Columbia for a master’s in music education and then returned to our school. He loved Macalaster.
I checked out their theater and dance and there are technique classes in ballet and modern dance, so that’s great. Four theater productions and two dance productions a year. Looks wonderful.
If you went to an architecture camp last year, and are now thinking about music or maybe music theater, it would seem as if you are appropriately exploring various interests. My only other advice would be to continue to explore a place as rich as Macalaster, without trying to decide on your future in any absolute way. In other words, stay open to possibilities 
You can study anything really, and take private voice lessons, and do extracurricular singing. The path is up to you and is a lot more flexible over time than you might think. In fact, major doesn’t always match career at all, or even grad school. Enjoy! I am excited for you…