The root left to the bass player. Frees a finger for a tension.
Galt is G, B, D#, F and Ab — G7 with every tension it can carry altered at once.
It sounds maximum tension, barely holding together. Not one chord but an instruction: take the root, third and flat seventh, add any two alterations, and let the rest go.

| G | B | D# | F | Ab |
|---|---|---|---|---|
| 1 | 3 | ♯5 | ♭7 | ♭9 |
Altered dominant — the hardest pull available.
Also written G7alt, G7altered or G altered dominant. The same chord either way; which spelling you meet depends on who wrote the chart.
Leave the root to the bass player. In a band nobody misses it, and the ear supplies it from the guide tones anyway.
The finger it frees goes to a tension, which is why these sound richer than the shape they came from rather than thinner.
Galt has 13 of them, on the top four strings, the middle four strings and strings 5-3-2-1, from open position up to the 12th — every inversion the chord has: B in the bass, D# in the bass, F in the bass and Ab in the bass. The one to learn first is the D# shape at the nut, which is the easiest grip here.
5 of them sit on the top four strings, so you can run the inversions up one set without changing strings — which is the whole reason to learn them as a family rather than as separate grips.
Start with xx5607 — 1 open string and only 3 fretted notes. 1 of the 9 shapes here sits in open position. None of them needs a barre. Together they cover the neck from the 2nd fret to the 12th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 32x023 | open position | G, root position | G | 1 open string |
| 32x423 | 2nd fret | G, root position | G | all fretted |
| xx5423 | 2nd fret | G, root position | G | all fretted |
| 3454x3 | 3rd fret | G, root position | G | all fretted |
| xx5607 | 5th fret | G, root position | B | 1 open string |
| xx5687 | 5th fret | G, root position | B | all fretted |
| x-10-9-0-0-9 | 9th fret | G, root position | Db | 2 open strings |
| x-10-9-12-12-9 | 9th fret | G, root position | Db | all fretted |
| x-10-11-12-12-x | 10th fret | G, root position | B | all fretted |
The same notes rebuilt from scratch give 6 shell voicings, each on its own page.
Tensions. A shell of Galt, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (C#).
Galt is a dominant with its tension raised, so it still points at C — harder than a plain seventh does, because the altered tones sit a semitone from where they are going.
Voice by voice, Galt → C. 4 voices move by a semitone, and one note is common to both chords.
| In Galt | Moves | In C |
|---|---|---|
| G, the root | stays where it is | G, the fifth |
| B, the major third | rises a semitone | C, the root |
| D#, the sharp fifth | rises a semitone | E, the major third |
| F, the flat seventh | falls a semitone | E, the major third |
| Ab, the flat ninth | falls a semitone | G, the fifth |
Every note of Galt is in G altered.
Change one note of Galt and you have Gaug7 (drop the flat ninth), Gaug9 (the flat ninth becomes a ninth) or G7b9 (the sharp fifth becomes a fifth).
Galt is an altered chord — a dominant seventh with its fifth or ninth moved. Altered dominant chords on every root.
On Galt’s sound and use this page follows Mark Levine, The Jazz Theory Book (Sher Music, 1995). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.