Estelle Liebling
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Estelle Liebling was an American soprano, composer, arranger, music editor, and celebrated voice teacher and vocal coach.
Estelle Liebling in the 1920s
Estelle Liebling, 1901
Estelle Liebling (c. 1920–1925)
Mathilde Marchesi
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Mathilde Marchesi was a German mezzo-soprano, a singing teacher, and a proponent of the bel canto vocal method.
Mathilde Marchesi