There aren't any which is why she is playing a piece in C major and if you listen carefully you will hear some notes are altered from the original. I don't think it will catch on, totally impractical and simply a curiosity.
Well, sometimes creativity works best under tighter restrictions, but this is going a bit far to achieve that! I imagine the modern ear would tire of this very quickly, with every piece in the same key and with no accidentals at all. I wonder what the original intent behind the design of this instrument this was?
Just seeing the picture made me recoil! Seems we need that tension in the music that is created by the non-harmonic tones in the chords and melodies in order to appreciate more the relaxation.
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