Assertion: concertina's note | /r/HasProperty | played with same finger
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text: One can assign a finger to every "column" of notes (re-based for different keys and offset on alternate rows for the Hayden), and very seldom will a tune require successive notes to be played with the same finger (or alternate fingering adopted)—at least this is certainly true for the Maccann system, and my limited trials with the Hayden system seem much the same.