The phrase "music roll" refers to a cylindrical music storage device that has a continuous sheet of paper or plastic with holes punched in it which triggers musical notes when played on a mechanical instrument. Some synonyms for "music roll" include "piano roll," "player piano roll," or simply "roll music." While "piano roll" specifically refers to the music roll designed for use with pianos, "player piano roll" refers to music rolls for all types of mechanically operated instruments, including organs, harmoniums, and reed organs. The term "roll music" can refer to any form of music that is played on a roll, including both traditional and contemporary genres.