Final answer:
Bain changed the mission of the School of Music by expanding the focus on vocal training and performance.
Step-by-step explanation:
The establishment of the Opera program at the School of Music by Bain changed the mission by expanding the focus on vocal training and performance. This means that there was more emphasis on developing singing skills and putting on opera performances. There is no mention of reducing classical music emphasis, eliminating music education programs, or increasing funding for instrumental music.