"4812" . "783.12 |c Duetten (verschillende zangstemmen) |d Duets (different singing voices)" . "781.47 |c Met begeleiding |d With accompaniment" . . "783.123235147" . . . "4812 781.47 |c Met begeleiding |d With accompaniment 782.3235 |c Missen - proprium |d Masses - proper 783.12 |c Duetten (verschillende zangstemmen) |d Duets (different singing voices) 783.123235147" . "782.3235 |c Missen - proprium |d Masses - proper" . . . "4812" .