Sheet music is a type of printed music. The music that musicians have in front of them when they play is printed music. The sheet or sheets of paper that contain(s) the written notation of what the musician are to play is called printed music. Sheet music usually refers to a "single sheet" of music; that is, one song or piece printed separately. Printed music includes sheet music but also includes music published in collections. People often confuse sheet music with printed music. 