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Releases by Willi Apel

Cover for Willi Apel · The Notation of Polyphonic Music 900 1600 (Paperback Book) (2010)

The Notation of Polyphonic Music... (2010)

Cover for Willi Apel · Gregorian Chant (Paperback Book) [Reprint edition] (1960)

Reprint edition

Gregorian Chant (1960)