A musician's a person who plays or writes music. Musicians can be classified by their roles in creating or performing music: An instrumentalist plays a musical instrument. A singer (or vocalist) uses his or her voice as an instrument. Composers, songwriters and arrangers create musical compositions, songs and arrangements. These may be transcribed in music notation, performed or recorded. A conductor leads a musical ensemble. A conductor can simultaneously act as an instrumentalist in the e… (More on Musician)