You could look at Bard, where all conservatory students do a double degree, and at other schools that have both conservatories and BA programs (Oberlin, Lawrence, Ithaca, many universities etc). Doulble degrees are generallly 5 years and combining two intensive, sequential majors like music and science can be difficult, but people do it.
You can also study science and continue private lessons, practice and extracurricular performance at many, many schools. Students who do this can still get into grad programs in music if their talent and hard work have kept them at that level, regardless of major. Try to take some theory, history or other music classes as electives.
Here is an essay that might help you think about things: http://www.peabody.jhu.edu/conservatory/admissions/tips/doubledegree.html