The choice of instrument is not entirely innocent. Harpsichords are rich in harmonics, and those harmonics are almost exactly multiples of the fundamental. This

The choice of instrument is not entirely innocent. Harpsichords are rich in harmonics, and those harmonics are almost exactly multiples of the fundamental. This is perfect for revealing natural ratios in chords. Pianos have "bent" harmonics which would slightly obscure this. This is inharmonicity: https://en.wikipedia.org/wiki/Inharmonicity https://en.wikipedia.org/wiki/Inharmonicity