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A lot of original public-domain melodies actually sound off compared to the versions commonly used now. Worse, for lack of a better term.
Like I would rather hear the common renditions of "Will the Circle Be Unbroken" or "Seeing Nelly Home". Luther's "Ein Feste Burg" isn't bad at all, but it predates the modern period's strong preference for isometric music.
I imagine part of the fun for ZUN must be seeing some really technically awesome artists and musicians just go absolutely nuts on a mere spark of inspiration. At one point in my life that's what I was going for. I think I might have to settle for my biggest cultural impact being writing a phrase that's been "viewed" (certainly not read) over 1B times according to Facebook.