What player piano is made of
A piano that plays from a perforated roll.
- Perforated piano roll — has part. Perforated paper with the tune recorded on it.
- Tracker bar — has part. Holes let air through to the valves.
- Bellows — has part. Pedal bellows create suction.
- Pneumatic pushers — has part. They press the keys when signalled by holes.
- Program control of a machine — uses. The tune is recorded on a perforated roll.
- Music notation — uses. The rolls encode notes.
- Wood — is made of. The case is wood.
- Paper — is made of. The program is a perforated paper roll.