Perfect unison (P1) has 0 half steps
Perfect fourth (P4) has 5 half steps
Perfect fifth (P5) has 7 half steps
Perfect octave (P8) has 12 half steps
Perfect intervals are the unison, fourth, fifth, and octave. Perfect intervals
are formed in the major scale when the lower note is the tonic.
Perfect unison (P1) has 0 half steps
Perfect fourth (P4) has 5 half steps
Perfect fifth (P5) has 7 half steps
Perfect octave (P8) has 12 half steps
