Piano Rolls

A piano roll is the medium used to operate the player piano or pianola, band/fairground organs, calliopes and hand-cranked organs and orchestrions and pipe organs as well. more...

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A piano roll is a roll of paper with perforations (holes) punched in it. The position and length of the perforation determines the note played on the piano. The piano roll moves over a device known as the 'tracker bar', which first had 58 holes, was expanded to 65 and then was upgraded to 88 holes (generally, one for each piano key). When a perforation passes over the hole, the note sounds.

Piano rolls have been in continuous mass production since around 1897. Though they are still being made today, MIDI files represent a modern way in which musical performance data can be stored. MIDI files accomplish digitally and electronically what piano rolls do mechanically. Software for editing a performance stored as MIDI data often has a feature to show the music in a piano roll representation.

After hundreds of companies of this booming business produced piano rolls different in size and perforation, in 1909 the American producers of piano rolls and mechanical pianos as well agreed to a standard in the Buffalo Convention.

Reproducing Pianos

Rolls for the reproducing piano were generally made from the recorded performances of famous musicians. Typically, a pianist would sit at a specially designed recording piano, and the pitch and duration of any notes played would be either marked or perforated on a blank roll, together with the duration of the sustaining and soft pedal.

Reproducing pianos can also re-create the dynamics of a pianist's performance by means of specially encoded control perforations placed towards the edges of a music roll, but this coding was never recorded automatically. Different companies had different ways of notating dynamics, some technically advanced (though not necessarily more effective), some secret, and some dependent entirely on a recording producer's handwritten notes, but in all cases these dynamic hieroglyphics had to be skillfully converted into the specialized perforated codes needed by the different types of instrument.

Recorded rolls play at a specific, marked speed, where for example, 70 signifies 7 feet of paper travel in one minute, at the start of the roll. On all pneumatic player pianos, the paper is pulled on to a take-up spool, and as more paper winds on, so the effective diameter of the spool increases, and with it the paper speed. Player piano engineers were well aware of this, as can be seen from many patents of the time, but since reproducing piano recordings were generally made with a similar take-up spool drive, the tempo of the recorded performance is faithfully reproduced, despite the gradually increasing paper speed.

The playing of many pianists and composers is preserved on reproducing piano roll. Gustav Mahler, Edvard Grieg, Claude Debussy, Sergei Rachmaninoff, Alexander Nikolayevich Scriabin and George Gershwin are amongst the composers who have had their performances recorded in this way.

Read more at Wikipedia.org