Pasqual Mario Marafioti was a physician and laryngologist for the Metropolitan Opera. He gave up his medical practice in 1930 and became a vocal coach for Metro pictures. There he coached Enrico Caruso as well as Marion Bell. He was also Caruso's personal physician. (From Wikipedia)
More about P. Mario Marafioti:Books by P. Mario Marafioti:
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Marafioti, P. Mario (Pasqual Mario): Caruso's Method of Voice Production: The Scientific Culture of the Voice (New York and London: D. Appleton and Co., 1922) (multiple formats at archive.org)
Additional books by P. Mario Marafioti in the extended shelves:
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Marafioti, P. Mario (Pasqual Mario): Caruso's method of voice production ; the scientific culture of the voice (D. Appleton and Company, 1922) (page images at HathiTrust; US access only)- Marafioti, P. Mario (Pasqual Mario): Caruso's method of voice production; the scientific culture of the voice (D. Appleton and Company, 1923) (page images at HathiTrust; US access only)
- Marafioti, P. Mario (Pasqual Mario): The new vocal art (Boni & Liveright, 1925) (page images at HathiTrust)
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