The Vaccai method teaches control . Without control, an alto voice sounds muddy or shouty. With Vaccai, the voice becomes a velvety, precise instrument capable of singing everything from Bach (Christ lag in Todesbanden) to Sondheim (Send in the Clowns).
In the age of Beyoncé, Adele (a mezzo), and Karen Clark (gospel contralto), does a 19th-century Italian method matter? vaccai pdf alto
Many digital stores sell the Schirmer edition as a PDF, which often includes better English translations. The Vaccai method teaches control