Noun
a boy who sings in a choir
Source: WordNetJosquin became a choirboy with his friend and colleague the Franco Flemish composer Jean Mouton at Saint-Quentin's royal church, probably around 1460. Source: Internet
The teacher's position and house were given to a successor, and Bruckner was sent to the Augustinian monastery in Sankt Florian to become a choirboy. Source: Internet