A#13(#5) Guitar Chord | How to Play The A# Dominant Thirteen Sharp Fifth Chord
The A#13#5 chord, also read as A# thirteenth sharp five, is spelled A#, C##, E##, G#, B#, D# and F##: the root, major third, raised fifth, minor seventh, ninth, natural eleventh and thirteenth.
It sounds identical to Bb13#5, the same pitches under a different spelling. The double sharps in C##, E## and F## come from keeping one letter name per chord tone, even though they sound like simpler notes.
The root, major third, raised fifth and minor seventh form an augmented seventh chord, and the ninth, eleventh and thirteenth sit above it.
A# 13th with sharp 5th guitar chord is also written as A#13(#5), A#13#5 or A#13+5.
A# 13(#5) chord Notes:
How the Dominant Thirteen Sharp Fifth chord is built:
Formula: 1 3 #5 b7 9 11 13
A# 13(#5) 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#13#5?
A#13#5 contains A#, C##, E##, G#, B#, D# and F##. That is the root, major third, sharp fifth, minor seventh, ninth, eleventh and thirteenth.
Is A#13#5 the same chord as Bb13#5?
Yes, both names use the same seven pitches. Bb13#5 spells them Bb, D, F#, Ab, C, Eb and G, which avoids the three double sharps of A#13#5.
Why does A#13#5 have E## as its fifth?
The perfect fifth over A# is E#. The sharp fifth raises it by one more half step, which gives E##, a note that sounds like F#.
Why is A#13#5 considered an augmented chord?
Its first three notes, A#, C## and E##, form an augmented triad: a major third followed by another major third. The seventh, ninth, eleventh and thirteenth are stacked on top.
