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==== Numbering ====
The intervals are numbered 2-7 corresponding to the intervals formed within the common 7-note (heptatonic) scales. These scales use one of each of the numbers, counting up from with each next note in the root notescale. For example, the common major scale uses {{M2|M2}}, {{M3|M3}}, {{P4|P4}}, {{P5|P5}}, {{M6|M6}}, and {{M7|M7}}. A note played against itself with the same pitch (for instance on two different instruments) is called a {{U|Unison}} interval. The same notes played as different pitches are referred to as an {{OctU|Octave}}.
Where the names have ()'s around a word in the description, that word is optional, and often omitted. Major 2nd, perfect 4th, and perfect 5th are all implied by 2nd, 4th, and 5th, as they are present in the common major as well as minor scales.