A#add9 Guitar Chord Chart and Fingering
The A# add nine chord (A#add9) takes the major triad A#, C## and E# and adds the ninth, B#, without any seventh.
The A# major scale contains every note of the chord, so it is the scale for soloing or filling in melody. Folded back into one octave, the ninth sits a whole step above the root. A#add9 sounds identical to Bbadd9, spelled Bb, D, F and C, and the double sharps in the A# spelling are why Bbadd9 is the name you will normally see.
It differs from a sus2 by one note: sus2 replaces the third with the second, while add9 keeps both.
A# added 9th guitar chord is also written as A#add9, A#(add9), A#add2 or A#maj(add9).
A# add9 chord Notes:
Chord structure of the Major Ninth Added chord:
Formula: 1 3 5 9
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Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What notes are in A# add nine?
A# add nine contains A#, C##, E# and B#: root, major third, perfect fifth and ninth. The B# is an octave and a whole step up from the root A#.
Is A#add9 the same chord as Bbadd9?
Yes. A#add9 is spelled A#, C##, E#, B#, and Bbadd9 is spelled Bb, D, F, C. The pitches are the same, so they sound alike, and the flat spelling avoids double sharps.
How is A# add nine different from a suspended second chord?
Both include the ninth or second, B#. A suspended second chord replaces the major third with that note, while A# add nine keeps the third, C##, and adds the ninth on top.
Why does A#add9 contain a C double sharp?
The major third must use the letter C, and four semitones up from A# is C##. It sounds like D. The fifth is E#, which sounds like F.
