Quintal harmony is harmonic structure preferring the perfect fifth, the augmented fifth and the diminished fifth. For instance, a three-note quintal chord on C can be built by stacking perfect fifths, C–G–D.
What is quartal?
a quarter of a calendar year (e.g. Q1-4)
What is a quartal voicing?
The term “quartal” in music refers to the interval of a fourth. When musicians refer to quartal voicings they are referring to chords that are built using intervals of a fourth (as opposed to intervals of a third, like major or minor triads, which are referred to as “tertian”).