Wiktionary
n. A musical ensemble associated with a school, not necessarily a musical school; e.g. marching band.
Wikipedia
A school band is a group of student musicians who rehearse and perform instrumental music together. A concert band is usually under the direction of one or more conductors (band directors). A school band consists of woodwind instruments, brass instruments and percussion instruments, although upper level bands may also have string basses or bass guitar.
School bands tend to be more common in the United States. School bands in the United Kingdom are generally similar to those in the US although pure brass bands are more commonplace in schools than in the US. Some countries usually prefer certain special types of bands, usually drums, over conventional ones. The school band movement in Japan is unusually strong, organized around an enormous competition system administered by the All-Japan Band Association. Many international observers of Japanese school bands consider them to be the most impressive in the world, particularly among very young students, and Japan is also home to one of the world's leading professional concert bands, the Tokyo Kosei Wind Orchestra.
Usage examples of "school band".
The World War I soldiers first, their faces strangely old under their pie-plate helmets, with their sign which read THE DERRY VFW WELCOMES HOME OUR BRAVE BOYS, then the Boy Scouts, the Kiwanians, the Home Nursing Corps, the Derry Christian Marching Band, then the Derry World War II vets themselves, with the high-school band behind them.
Her major interest, however, became her son Magnus, only eight year old but such a strong trumpeter that he was asked to play in the school band and in the Huntsville orchestra as well.
I have better things to do with my time than waste it trying to sign on a nobody high school band.
The high school band turned left on Second Street and took another left by the schoolyard just a block east.
It's been fixed up real nice, and tomorrow is the grand opening with a parade featuring the high school band and local dignitaries.
There was a boy who didn't even talk six months ago who now has not only opened up but is starting to play a bugle for the school band.
She's right, there's a lot she doesn't know, but even so I'd bet she knows more than anyone except Marcus Wendell, the school band director.
Attendance was in the thousands, and the entire assemblage was still as the school band, stripped from fifty-six to a bare forty, played the school song and taps.
A small, evilsounding high school band struck up the National Anthem, then a medley of Sousa marches, and then, with taste so bad it was almost grisly, Marching to Pretoria.