A person who arranges a piece of music for a singer, a group of performers or other music ensembles.
What does an arranger do?:
His primary role is to arrange a piece of music based on the needs or requirements of a performer, a group of performers, a conductor, producer or music director. The arranger makes sure that every aspect of a music piece is well harmonized, from the instruments down to the tempo. The music that an arranger works on may either be an original or an already existing music piece.
REQUIREMENTS FOR AN ARRANGER