Assertion: organ improvisation | /r/HasProperty | e.g. keller
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Source sentences:
text: The earlier and most influential schools of organ improvisation (e.g. Keller, 1939; Dupré, 1962) mirror this relationship, but reviews of later textbooks from other areas display an increasingly eclectic attitude, and attempts to cover major parts of the entire existing knowledge (e.g. Willstedt, 1996; Overduin, 1998).