It is important that you feel comfortable with the size of the institution. While size and quality are not synonymous, there are some things that are not possible in one or the other. For instance, if you are looking for a large marching band program, it will be unlikely that a small college would have it. It is strongly advisable to consider institutions that are accredited academically by the appropriate accrediting agencies which includes accreditation in music. You can be assured that the music program meets at least a minimum standard.
Musical considerations are of the utmost importance.
Investigate to see which schools offer your desired degree and concentration. Most high school guidance counselors keep copies of college catalogues and bulletins which tell what degree programs are offered. You may find a small music program in a large university and vice versa. If you prefer an intimate setting, you may give up some opportunities which may be available in the large setting. Some music programs enroll fewer than one hundred majors while others enroll many hundreds.