F#9

F#9 is F#, A#, C#, E and G#, a dominant ninth. The shape this page opens on is written 2121xx, lowest string first.

Note by note. F# is the root, A# is the major third, C# is the fifth, E is the flat seventh and G# is the ninth.

Also written F#dom9 or F# dominant 9. The same chord either way; which spelling you meet depends on who wrote the chart.

There are 9 common shapes for F#9 on the guitar, and 40 derived voicings in 5 families.

One note away. Change a single note of F#9 and you have F#maj9 (with one note moved), F#m9 (with one note moved), F#add9 (with one note taken away), F#69 (with one note moved), F#7 (with one note taken away) or F#9b5 (with one note moved).

In which keys. Every note of F#9 belongs to Ab minor (the ♭VII) and B major (the V).

The common shapes, written lowest string first: 2121xx, 242324, 242124, xx4354, 6x4654, x98999, x-11-11-11-11-12, 14-11-11-13-11-12, 14-13-14-13-14-x.

Under the hand. None of the shapes for F#9 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 6 of the 9 need a barre. Together they cover the neck from the 1st fret to the 14th.

Where it goes. F#9 is the V of B, and that is where it goes if it goes anywhere: the third and the flat seventh are a tritone apart, and both resolve by a semitone into B.

Shell. Root, third and seventh: the guide tones fix the quality, so the fifth is dropped. That is what leaves a string free, so pick a tension to put on top. F#9 has 2121xx, xx4354, x9899x, 14-13-14-13-x-x.

Drop 2. A close-position chord with the second voice from the top lowered an octave. Sits on four adjacent strings. F#9 has 2121xx, xx4354, x9899x, 14-13-14-13-x-x, x1415x, 4743xx, x7637x, 6969xx.

Drop 3. The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped. F#9 has x1x152, 4x435x, x7x374, x9x996, 6x697x, 12-x-8-11-9-x, x-11-x-11-11-12, 14-x-14-13-11-x.

Rootless. The root left to the bass player. Frees a finger for a tension. F#9 has x1212x, xx2324, xx6656, xx8999, x-11-11-9-11-x, x-x-11-13-11-12, x-13-14-13-14-x, x1x120.

Open string. An open string left ringing against a fretted grip. Because it costs no finger, it sounds a note the closed shape has none left for -- a tension on top, or a pedal root underneath. Either a familiar grip with open strings added, or a shape so sparse the open strings carry the chord. These belong to their key rather than to a shape, so D, A, G and E have many and Eb a handful. F#9 has 040354.

Tensions. A shell of F#9, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (B#), the b13 (D) and the 13 (D#).

What kind of chord this is. F#9 is a dominant chord — root, major third, fifth, minor seventh. dominant seventh chords on every root, and what they are for.

The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.