What is a Cadential in music?
'Cadential' simply refers to the fact that this harmonic formula occurs at cadences, that is, the end of musical phrases. As for the numbers, these come down to us from the Baroque period, which lasted from the year 1600 to about 1750.
What is a Cadential 64 chord?
A Cadential 6/4 (pronounced Six Four) Chord Progression is a series of triads (chords) that are played to serve a purpose in the music. These chords sound nice together. They make sense musically. They create a nice "finished" effect.
What do you double in a Cadential 64?
The doubled dominant in the Cad 6/4 is split between the bass and alto, while the tenor articulates the tonic and the soprano the mediant. Similarly to any other chord, non-harmonic tones can be applied to the cadential 6/4.