Assertion: concertina's button | /r/HasProperty | notated a flat
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text: Finally, there is a question (already briefly alluded to) that has been simmering on a back burner throughout this discussion: why do the method books (at least those at which I’ve looked) insist on “play-it-as-spelled,” that is, a notated D sharp with the button next to D natural, a notated A flat with that next to A natural and so on?