Originál: Practical Method. Nicola Vaccai was born in Tolentino, Italy, on March 15th, 1790. Benche di senso privo. Nicola Vaccai.
Překlad: Praktická metoda. Metodo Pratico - Lektion 9. Metodo Pratico - Lektion 9. Low Voice noty. Hlas Solo noty. 1790-1848.