A Chord in Time: The Evolution of the Augmented Sixth from Monteverdi to Mahler

For centuries, the augmented sixth sonority has fascinated composers and intrigued music analysts. Here, Dr Mark Ellis presents a series of musical examples illustrating the 'evolution' of the augmented sixth and the changing contexts in which it can be found. Surprisingly, the sonority emerged from one of the last remnants of modal counterpoint to survive into the tonal era: the Phrygian Cadence. In the Baroque period, the 'terrible dissonance' was nearly always associated with negative te...