__MAIN INTERVAL NAMES :__

*( The intervals within one octave )*

** P1** : ( perfect unison ) = 0 semitones

** d2** : ( diminshed second ) = 0 semitones

** m2** : ( minor second ) = 1 semitone

** A1** : ( augmented unison ) = 1 semitone

** M2** : ( Major second ) = 2 semitones

** d3** : ( diminished third ) = 2 semitones

** m3** : ( minor third ) = 3 semitones

** A2** : ( augmented second ) = 3 semitones

** M3** : ( Major third ) = 4 semitones

** d4** : ( diminished fourth ) = 4 semitones

** P4** : ( perfect fourth ) = 5 semitones

** A3** : ( augmented third ) = 5 semitones

** aug4** : ( augmented fourth ) = 6 semitones

** dim5** : ( diminished fifth ) = 6 semitones

** P5** : ( perfect fifth ) = 7 semitones

** d6** : ( diminished sixth ) = 7 semitones

** m6** : ( minor sixth ) = 8 semitones

** A5** : ( augmented fifth ) = 8 semitones

** M6** : ( Major sixth ) = 9 semitones

**dim7** : ( diminished seventh ) = 9 semitones

** m7** : ( minor seventh ) = 10 semitones

** A6** : ( augmented sixth ) = 10 semitones

** M7** : ( Major seventh ) = 11 semitones

** d8** : ( diminished octave ) = 11 semitones

** P8** : ( perfect octave ) = 12 semitones

** A7** : ( augmented seventh ) = 12 semitones

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__COMPOUND INTERVAL NAMES :__

*( names of intervals which span more than one octave )*

** d9 **: ( diminished ninth ) = 12 semitones

** m9** : ( minor ninth ) = 13 semitones

** A8** : ( augmented octave ) = 13 semitones

** M9** : ( Major ninth ) = 14 semitones

** d10** : ( diminished tenth ) = 14 semitones

** m10** : ( minor tenth ) = 15 semitones

** A9** : ( augmented ninth ) = 15 semitones

** M10** : ( Major tenth ) = 16 semitones

** d11** : ( diminished eleventh ) = 16 semitones

** P11** : ( perfect eleventh ) = 17 semitones

** A10 **: ( augmented tenth ) = 17 semitones

** d12** : ( diminished twelfth ) = 18 semitones

** A11** : ( augmented eleventh ) = 18 semitones

** P12** : ( perfect twelfth, tritave ) = 19 semitones

** d13** : ( diminished 13th ) = 19 semitones

** m13** : ( minor thirteenth ) = 20 semitones

** A12** : ( augmented twelfth ) = 20 semitones

** M13** : ( major thirteenth ) = 21 semitones

** d14** : ( diminished fourteenth ) = 21 semitones

** m14** : ( minor fourteenth ) = 22 semitones

** A13** : ( augmented thirteenth ) = 22 semitones

** M14** : ( Major fourteenth ) = 23 semitones

** d15** : ( diminished fifteenth ) = 23 semitones

** P15** : ( perfect fifteenth, double octave ) = 24 semitones

** A14** : ( augmented fourteenth ) = 24 semitones

** A15** : ( augmented fifteenth ) = 25 semitones

** M17** : ( major seventeenth ) = 28 semitones

- Stop -

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*Melodic intervals occur sequentially.*

*Harmonic intervals occur simultaneously.*

*Compound intervals are intervals that span more than one octave.*

*Simple intervals are equal to or less than one octave in distance.*

*An augmented fourth ( or diminished fifth ) is called a tritone because it encompasses three whole steps.*

*C up to G is a 'fifth' because it encompasses five letter names ( C D E F G ).*

*C down to G is a fourth because it encompasses four letter names ( C B A G ).*

*Interval inversions :** When the top member of an interval is moved to the octave below the bottom member ( or vice versa ), the interval is said to be inverted.*

*A major interval contracted or decreased by a half step ( semitone ) is called minor.*

*A major or perfect interval expanded or increased by a half step ( semitone ) is called augmented.*

*A minor or perfect ineterval contracted or decreased by a half step ( semitone ) is called diminished.*

**Edited by lettuce, 15 February 2018 - 03:58.**