. "Massy, Sylvia"@en . . "1985Z"^^ . . "Sylvia Massy is an American entrepreneur, music producer, mixer and engineer, writer and artist in the United States. Massy is perhaps best recognized for her work on 1993's Undertow, the full-length double platinum-selling debut for Los Angeles rock band Tool and her works with System of a Down, Johnny Cash and Red Hot Chili Peppers."@en . . "Sylvia Massy"@en . . . "American record producer" . "non_performing_personnel" . "Sylvia Lenore Massy"@en .