"781.43 |c Methodes, vocalises, uitvoeringstechnieken |d Methods, vocalises, performance techniques" . "6423" . "786.24143" . "786.24 |c Piano vierhandig |d Piano four hands" . "6423" . . "6423 781.43 |c Methodes, vocalises, uitvoeringstechnieken |d Methods, vocalises, performance techniques 786.24 |c Piano vierhandig |d Piano four hands 786.24143" . . . .