Authentic Cadence

A chord progression where the dominant chord is followed by the tonic chord- In the tonality of C major, an authentic cadence would be the dominant G major chord (G B D) moving to the tonic C major chord (C E G). In a perfect authentic cadence, the dominant chord in root position is followed by the tonic in root position, and according to some, the cadence is not perfect unless the uppermost voice is the tonic in the final chord. see Musical Cadences