The only exception was Winchester Cathedral, where a systematic collection of organa can be found in the troper part—the so-called "Winchester Troper".
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But notated evidence of alternative practices, where the organal voice changes between different strategies of heterophony (parallel and counter movement) and holding notes which support the modal colour of the cantus, can already be found as later added exemplification in monophonic manuscripts of the Abbeys in Saint-Maur-des-Fossés, Fleury, and Chartres.
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