piano roll
Noun
Meaning
piano roll (plural piano rolls)
A perforated roll of paper containing encoded music to be played by a pianola or player piano.
Examples
He also worked with the Aeolian Company for its 'Autograph Metrostyle' piano roll series wherein he indicated the tempo mapping for many of his pieces.
The "staff" is most widely referred to as "piano roll", created by extending the black and white piano keys.