A music roll predicates lessons, and there where lessons are must also be a teacher.
Can you give us an illustration of the respect in which the mere copyrighting of the music roll will do all that?
He knew that young girls do not stroll about with a music roll under their arm for the fun of it.
Day after day he would visit the music stores with his music roll tucked under his arm.
Other folks went up and down unnoted, until Marjie passed by with her music roll under her arm.