Perfect Consonances	Imperfect Consonances
Perfect Unison (1)	Minor Third (3)
Perfect Fifth (5)	Major Third (3)
Perfect Octave (8)	Minor Sixth (6)
	Major Sixth (6)
Diatonic Dissonances (can be resolved)	Chromatic Dissonances (avoided entirely)
Perfect Fourth (4)	Tritone (Diabolus in Musica)
Minor Second (2)	Any Other Augmented or Diminished Interval
Major Second (2)
Minor Seventh (7)
Major Seventh (7)