My high school started at 8:20 but we had a 0-period option at 7:15 which is when we were able to take other arts classes like concert band.
I ultimately was in 3 music related classes in high school: concert band at 0-period, jazz band at 4th period, and a small combo band after school 3-days per week.
I loved having a longer day when it meant I could do more of what I wanted to do and also get some flexibility around the school's otherwise rigid schedule but looking back I really appreciate that the longer day was at least partially from starting earlier.
Starting these longer days early meant I still had a lot of free time after school as well to spend with friends even if they were involved in the "standard" day and gave me unstructured free time before my parents came home and before I had to worry about doing things like homework.