| http://www.w3.org/ns/prov#value | - Piano rolls provide some of the most listenable documents of the work of leading performers and composers of the period, notably Gustav Mahler, Feruccio Busoni, Sergei Rachmaninoff, Scott Joplin and George Gershwin.QRS is now a leading manufacturer of digitized and computerized player-piano technology that runs on CDs, The Buffalo News' Mark Sommer writes.
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