Challan - 380 bass and vocals given for the study of harmony - achievements of the author

380 bass and vocals given for the study of harmony, consonant chords of the free lessons book 9C (low on all foreign notes - achievements of the author) by Henri Challan (Professor at the Conservatoire National Superieur de Musique)

380 bass and vocals given for the study of harmony, consonant chords of the free lessons book 10C (soprano of all foreign notes - achievements of the author) by Henri Challan (Professor at the Conservatoire National Superieur de Musique)