Quartal and quintal harmony

In music, quartal harmony is the building of harmonic structures built from the intervals of the perfect fourth, the augmented fourth and the diminished fourth. For instance, a three-note quartal chord on C can be built by stacking perfect fourths, C–F–B♭.

${ \override Score.TimeSignature #'stencil = ##f \relative c' { \clef treble \time 4/4 <c f bes>1 } }$

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.

${ \override Score.TimeSignature #'stencil = ##f \relative c' { \clef treble \time 4/4 <c g' d'>1 } }$