Names of Intervals

Chromatic From Any Root

Half Steps	Common Names
0	Perfect Unison (PU)
1	Minor Second (m2)
2	Major Second (M2)
3	Minor Third (m3)
4	Major Third (M3)
5	Perfect Fourth (P4)
6	Diminished Fifth (D5) Augmented Fourth (A4)
7	Perfect Fifth (P5)
8	Minor Sixth (m6) Augmented Fifth (A5)
9	Major Sixth (M6)
10	Minor Seventh (m7) Augmented Sixth (A6)
11	Major Seventh (M7)
12	Perfect Octave (P8)
13	Minor Ninth (m9)
14	Major Ninth (M9)
15	Minor Tenth (m10)
16	Major Tenth (M10)

Notes in intervals can be separate and in order: ascending and descending or
played at the same time. Intervals are characterized by the grades of the scale,
taking each note of a scale & assigning a number. Intervals are the basis of chords.