Intervals are the distances between two notes. Each interval will have a number - 1, 2, 3, 4, 5, 6, 7, 8. These numbers are the distance between two notes, based upon counting the lines and spaces on the staff.
Intervals may be described as:
-Vertical or harmonic, if the two notes sound simultaneously
-Horizontal, linear, or melodic if they sound successively.
Intervals may be roughly classified as:
-Diatonic intervals, between the notes of a diatonic scale,
-Chromatic intervals, non-diatonic intervals between the notes of a chromatic scale,
-Minute intervals (commas, and microtones), sometimes so small that the difference in pitch between the two notes cannot be perceived.

For example, if we count lines and spaces, starting from C and ending on G, we count: C,D,E,F,G = 1,2,3,4,5, Therefore, the interval from C to G is a fifth (5th).
We can also keep counting past 8, through 9, 10, 11, 12, and 13, but usually not past 13.
List of interval types:
0-Perfect Unison-------P1
1-Minor Second-------m2
2-Major Second------M2
3-Minor Third----------m3
4-Major Third----------M3
5-Perfect Fourth------P4
6-Diminished Fifth-----d5---Tritone
6-Augmented Fourth--A4---Tritone
7-Perfect Fifth--------P5
8-Minor Sixth---------m6
9-Major Sixth---------M6
10-Minor Seventh----m7
11-Major Seventh----M7
12-Perfect Octave----P8
Interval quality:
Intervals also have another identifier in addition to number called the interval quality. Intervals can be called Major (M), minor (m), Perfect (P), Augmented (A), or diminished (d).
Major Intervals:

Minor Intervals:

Perfect Intervals:

Augmented Intervals:

Diminished Intervals:


*The intervals contained in the table are diatonic to C major. All other intervals are chromatic to C major.
Hope you enjoy .See you in next lesson of Music Theory Series.Keep rocking
