Musicians and music theorists struggle to find comprehensive reference data on Just Intonation chord ratios and historical definitions

Musicians, composers, and music theory researchers need authoritative, organized lists of Just Intonation chords with their precise frequency ratios, particularly historical definitions like those by Fétis. Current solutions lack centralized, searchable databases of this specialized musical knowledge, forcing practitioners to manually compile information from scattered academic sources or reconstruct ratios themselves, wasting hours on research that should be readily available.