Music: Quarter-Size Violinist

Violinist Diana Halprin last week got a break a lot of musicians wait a lifetime for —and it came at age six. She was engaged to play as soloist with the Philadelphia Orchestra. Picked from a field of 17 aspiring moppets, aged six to twelve, Diana will perform at a concert for children next season—the youngest violinist ever to play with the orchestra.

Father Orcka Halprin, onetime violinist with the Detroit Symphony, got the idea his daughter might be a prodigy when he heard her picking out radio tunes on a toy piano at the age of two. He tested her...