Pipe organ
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The pipe organ is a musical instrument that produces sound by driving pressurised air through the organ pipes selected from a keyboard. Because each pipe produces a single tone and pitch, the pipes ar
Pipe organ in the collegiate church of St. Michael in Neunkirchen am Brand
Hydraulis from the 1st century BC, oldest organ found to date, Museum of Dion, Greece
4th-century AD "Mosaic of the Female Musicians" from a Byzantine villa in Maryamin, Syria.
9th-century image of an organ, from the Utrecht Psalter.
Organ reform movement
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The Organ Reform Movement or Orgelbewegung was a mid-20th-century trend in pipe organ building, originating in Germany. The movement was most influential in the United States in the 1930s through 1970
Holtkamp Organ #1,939 (1978–2015) at University of Notre Dame
