A 7b9 Chord on 8-String Guitar
Play A 7b9 on 8-String Guitar: diagrams, finger positions, intervals, and every voicing up and down the neck for this instrument.
The A 7b9 chord is an extended or altered dominant that stacks ninths, elevenths, thirteenths, or chromatic tensions over a dominant-seventh core. It is built from the notes A, A#, C#, E, G. This page shows how to play A 7b9 on 8-String Guitar with clear fretboard diagrams and suggested finger positions.
There is no open-string version on 8-String Guitar: the lowest shape barres fret 5 and covers 3 frets. The F# and B strings stay silent, so 6 of 8 sound. A falls on the E string. It sounds from A2 up to A#4. 2 voicings are charted, the highest starting at fret 12.
8-String Guitar is tuned F#–B–E–A–D–G–B–E, with 15 frets to work with.
Browse alternate voicings to find the one that sits best under your fingers, then compare it with the other chord types built on A or explore the same shape in nearby keys. The diagrams list the notes in each voicing so you can connect the shape to the theory behind it.