perfect interval

[GhostMice]

could some one explaine what a perfect interval is please.

[Permanent Solution]

# Unison, fourth, fifth, octave. These intervals may be perfect, augmented, or diminished.

* They are called perfect because of their extremely simple pitch relationships resulting in a high degree of consonance.
* A perfect fourth is five semitones.
* A perfect fifth is seven semitones.
* A perfect octave is twelve semitones.
* A perfect unison occurs between notes of the same pitch, so it is zero semitones.
* In each case, an augmented interval contains one more semitone, a diminished interval one fewer.



Wikipedia yey

[Akira]

Intervals of a 4th, 5th, unison or octave are described as "perfect" instead of major. It's just the name.

EDIT: Pwned. :upset:

[Spazzout22]

p.s. Considered "perfect" because the intervals are the same between both major and minor scales (natural, melodic, and harmonic). All other intervals change between these scales. Hence: 2nds, 3rds, 6ths, and 7ths all have major and minor variations, as well as augmented and diminished variations; whilst 4ths and 5ths only have perfect (same for both major and minor) and their augmented and diminished counterparts.

Edit: except for seconds, as my RHD pointed out later this afternoon, those are made of magic.