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 pitch, the pipes are provided in sets called ranks, each of which has a common timbre, volume, and construction throughout the keyboard compass. Most organs have many ranks of pipes of differing pitch, timbre, and volume that the player can employ singly or in combination through the use of controls called stops.
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 pipe
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An organ pipe is a sound-producing element of the pipe organ that resonates at a specific pitch when pressurized air is driven through it. Each pipe is tuned to a note of the musical scale. A set of organ pipes of similar timbre comprising the complete scale is known as a rank; one or more ranks constitutes a stop.
The choir division of the organ at St. Raphael's Cathedral, Dubuque, Iowa. Wood and metal pipes of a variety of sizes are shown in this photograph.
The Wilhelmy American Flag Glass Pipe Organ
A set of flute pipes of a diapason rank in the Schuke organ in Sofia, Bulgaria.