Guitar Chord A#maj13: Structure, Notes and Theory

A#maj13 — a chord built on the note “A#” with a warm, “sunny” shimmer in the top voice. Adds a bright, open atmosphere to the music, perfect for heartfelt codas and smooth outros. Its gentle upper tone gives the harmony depth and completeness.

Formula and Structure of the A#maj13 Chord

Interval formula from the root note: 1 — 3 — 5 — 7 — 9 — 11 — 13. The chord consists of the following notes:

• Bb — unison and the main tonal anchor.
• D — major third with a bright major quality and clear stability above the tonic.
• F — perfect fifth, stabilizing the triad and adding tonal grounding.
• A — major seventh with a smooth jazz sparkle and slight tension toward the octave.
• C — major ninth, opening the top line and adding airiness to the texture.
• Eb — eleventh with a spicy fourth above the octave, best voiced apart from the third.
• G — thirteenth with a warm sixth above the octave, sounding beautiful in the top voice.

Together, these notes form the harmonic foundation of the A#maj13 chord, defining its sound and role in the musical context.

Alternative Names for the A#maj13 Chord

This chord may appear under different names:

• A#Δ13

All variants refer to the same harmonic structure.

Using the A#maj13 Chord

Place the 13 in the top voice to highlight its radiant, warm quality. Combine with the 9 for a soft yet rich texture. In the middle register, separate the 3 and 11 to avoid muddiness. Use for final chords and outros where a lingering aftertaste is important. Avoid excessive doubling of the 13 in the bass — it will lose its brilliance.

Conclusion

A#maj13 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.