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sad slow sacred depressing haunting

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Gregs chats
Organum

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Portative organs generally have a bellows attached to the backside of the instrument that must be pumped by the player. This organ has been provided with a separate, electrically driven pump and "windchest" so both hands are freed to play the keys (as they were with the ancient Greek and Roman "hydraulis").

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The composers are leonin perotin and Hildegarde of bingen