He might want to audition for both and see what happens. Friend’s son auditioned for piano and percussion. He was accepted for percussion at one school and piano at the other. Son had a friend in the bass studio at his school who also played Sax and another who was a vocal major and another who was a piano major. Being able to be proficient in Orchestra, Band and/or Choral tracks, will make the job search easier. Son added general music/choral and special music education during his undergrad years. Some music ed schools allow you to double major. It is extra work but can be done.