"high school band" is a perfectly acceptable, and commonly used, phrase in written English.
For example, "Susan had been part of the high school band since her freshman year."
The musical interludes include Lady Gaga songs played by a high school band.
He began studying piano at 7 and played mellophone in his high school band.
By the time he stepped down in 1988, the high school band had 170 members.
His father was a high school band director and a veteran of many big bands.
The bus carried 27 high school band members and three adults.
A high school band had set the mood earlier with a rendition of Pharrell Williams Happyy.
A high-school band was practicing "Louie, Louie".
Though Dearie was initially trained as a classical pianist, she gravitated to jazz while performing with a high-school band.
He was a director of the high-school band, and he played tackle on the football team.
The materials span from Reed's high-school band to the Velvet Underground to his final performances, in 2013.
No high-school band has ever sounded this good, but let's not fault the film for that.
