new member: why is the drum major such a jerk to everyone?  veteran member: i know he can be an arse sometimes, but he's just doing his job
an experienced member of a marching band who leads the other band members in the director's stead
"new member: why is the drum major such a jerk to everyone?  veteran member: i know he can be an arse sometimes, but he's just doing his job" What is the definition of "drum major"?