Major Thirteenth

M13

interval

At a Glance

Formula:
13 major
Notes:
C, A

Piano

Fretboard

eBGDAE

A compound interval - larger than an octave. Shown here within a single octave, same as its simple equivalent.

What It Is

An octave plus a major sixth (21 half steps).

How It Functions

The uppermost extension of a full thirteenth chord, stacking every diatonic extension above a dominant seventh.

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