783 Music for single voices    The voice
783.4 Middle voice vi
783 Nhạc cho đơn ca    Giọng ca
783.4 Giọng trung it
783 Musica per voci singole    La voce
783.4 Voce media en
783 Music for single voices
783.4 Middle voice de
783 Musik für Einzelstimmen    Die Stimme
783.4 Mittelstimme
Dewey Decimal Classification
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