Originalno: Basics of Keyboard Theory. Keys of C, F, G, D Major. Keys of C, G, D, A, F, Bb Major, a minor. Answer Book. Organ sheet music.
Prevod: Osnove teorije Keyboard. Ključi C, F, G, D Major. Ključi C, G, D, A, F, Bb-duru, mladoletniku. Odgovorite Rezervirajte.