Hiroko Okuda

APPARATUS FOR DETERMINING TONALITY FOR CHORD PROGRESSION

A tonality determining apparatus provides a tonality analysis of a chord progression. The apparatus includes a chord function knowledge database storing musical knowledge of evaluating a function of each chord in the chord progression. A keynote and function progression extractor determines a keynote and function of each chord in the chord progression from a chord progression input device in accordance with the function knowledge database. From the extractors results a tonality data generator produces tonality data defining a pitch class set available in each chord time interval. The tonality determining apparatus is applied to an accompaniment apparatus for playing an accompaniment with a desired tonality.