A# Major Thirteen (A#maj13) chords on guitar
The A# major thirteenth chord (A#maj13) is spelled A#, C##, E#, G##, B#, D# and F##. A#maj13 is the full stack of thirds, from the root up to the thirteenth, and it spells all seven notes of the major scale.
Every chord tone but the natural eleventh sits in the A# Lydian scale, a classic scale to play over maj13. The thirteenth (F##) is the same pitch as the sixth, one octave higher. A#maj13 sounds identical to Bbmaj13, spelled Bb, D, F, A, C, Eb and G,. This spelling needs C##, G##, F##, E# and B#, so Bbmaj13 is the easier name to read.
A# major 13th guitar chord is also written as A#maj13, A#M13, A#Δ13 or A#ma13.
Notes that compose the A# maj13 chord:
Tones in the Major Thirteen chord:
Formula: 1 3 5 7 9 11 13
A# Maj13 Chord Interactive Fretboard
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Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What notes are in A#maj13?
A#maj13 (A# major thirteenth) is spelled A#, C##, E#, G##, B#, D# and F##. That is seven notes, one for each letter name from A to G.
Is A#maj13 the same chord as Bbmaj13?
Yes, they sound identical. Bbmaj13 is spelled Bb, D, F, A, C, Eb and G, which needs no double sharps, while A#maj13 needs C##, G## and F##.
Why does A# major thirteenth have three double sharps?
The chord is built from the A# major scale, where the third C##, the seventh G## and the thirteenth F## each carry two sharps. Letter names stay in sequence, so they are not renamed.
Which scale fits A#maj13?
The A# Lydian scale: A#, B#, C##, D##, E#, F## and G##. It matches every chord tone except the eleventh, D#, which Lydian replaces with D##, its raised fourth.
What do the intervals 1 3 5 7 9 11 13 mean in A#maj13?
They are the root, major third, perfect fifth, major seventh, ninth, eleventh and thirteenth, stacked in thirds. The ninth, eleventh and thirteenth are the second, fourth and sixth scale degrees, an octave higher.
