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.
Fmaj7#5 is F, A, C# and E — Fmaj7 with the fifth raised a semitone.
It sounds weightless, with no pull in it. Unlike an aug7 there is no flat seventh dragging it anywhere, so it colours a tonic rather than replacing it with a dominant.

| F | A | C# | E |
|---|---|---|---|
| 1 | 3 | ♯5 | 7 |
Tonic — the lydian augmented sound.
Also written FM7#5, FΔ7#5, F+M7 or Fmaj7(#5). The same chord either way; which spelling you meet depends on who wrote the chart.
Root, third and seventh. The third and seventh, the guide tones, are what make the chord major, minor or dominant, so the fifth can go: it says nothing the symbol needs.
Three notes means a spare string, which is the real point. Put a tension on it.
Fmaj7#5 has 4 of them, on strings 6-4-3-2, strings 5-3-2-1 and the bottom four strings, from open position up to the 13th — all in one inversion, so the bass note never moves. The one to learn first is the F shape at the nut.
Start with xx3655 — no barre and low, at the 3rd fret. 1 of the 9 shapes here sits in open position. 3 of the 9 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 102220 | open position | F, root position | E | barred |
| 1x2221 | 1st fret | F, root position | F | barred |
| xx3655 | 3rd fret | F, root position | A | all fretted |
| x87655 | 5th fret | F, root position | A | all fretted |
| x879x9 | 7th fret | F, root position | C# | all fretted |
| x-8-11-9-10-x | 8th fret | F, root position | A | all fretted |
| x-x-11-10-10-12 | 10th fret | C#, 2nd inversion | E | all fretted |
| x-x-15-14-14-12 | 12th fret | F, root position | E | all fretted |
| 13-x-14-14-14-x | 13th fret | F, root position | C# | barred |
The same notes rebuilt from scratch give 13 drop 2, 9 drop 3 and 6 open string voicings, each on its own page.
Tensions. A shell of Fmaj7#5, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (G), the #11 (B) and the 13 (D).
How you get to it. The turn that lands on Fmaj7#5 is Gm7 to C7 — the ii and the V of F — and C7 shares its third and seventh with Gm7, so the hand barely moves between them.
Change one note of Fmaj7#5 and you have Fmaj7 (the sharp fifth becomes a fifth), Fmaj7b5 (the sharp fifth becomes a flat fifth), Faug (drop the major seventh), Faug7 (the major seventh becomes a flat seventh) or F/E (the sharp fifth becomes a fifth).
Fmaj7#5 is a major chord — root, major third, fifth. Major chords on every root.
On Fmaj7#5’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.