Singing class of boys from 1900

Looks like a singing class in school, all boys, maybe a choir, from a box in our home. My wife's great grandfather was singing all his years. Here he is sitting to the right 1900.They had a Minstrels Show to get some $ for there Canoe Club, He had a camera 1899 at least, we have a ton of his prints. The cyan prints he made some . He was born 1973 so the boys print he maybe to the left side second kid he was tall over 6 ft at 18 years. So maybe this print is from 1883 he would be 10 years old.