Film Scorer:
Composes orchestral and/or popular music meant for films or television shows. The role of the film composer is to create music that helps forward the story without overpowering the scene. Famous film scorers include:
John Williams Hans Zimmer
Frank Churhill
Also see Disney's Cinderella - The Men Behind the Songs and Horror Film Music Composers.
Instrumentalist:
Also called musicians, the instrumentalist plays a music instrument or several music instruments as a profession. He works in studios as a studio musician, in a band or as part of an orchestra. Also see this profile on The Professional Musician and this extensive list of Famous Musicians profiles.
Instrument Maker:
An instrument maker is one who builds, constructs, designs, and even repair music instruments. He/she has undergone extensive training and education in order to become a skilled instrument maker. The instrument maker understands the principles and complexities behind the construction of a specific instrument.
Also see Saxophone History and The History of the Violin
Librettist:
The librettist writes the libretto or the words that would be set to music in a stage production such as an opera. The librettist works closely with the composer, making sure that the words complement the music and vice versa. Also see Types of Opera.
Managing Artists:
The artist manager wears many hats; he is a businessman who sees to it that the artist he's managing has a steady stream of income-generating projects. He is a promoter who helps spread the word about his artist, creating attention through posters and radio or tv interviews. He is also a friend who makes sure his artist takes good care of himself and works hard in order to perform at his best.