Dominant 7th (no 5th)

Notes and formula

The formula is 1 – 3 – ♭7, or 0 – 4 – 10 in semitones. A dominant seventh with its perfect fifth removed.

What remains is the tritone between E and B♭ plus the root underneath it. That tritone is the entire functional content of a dominant chord — it is what pulls toward F — so the three notes say everything the four-note version says.

Why the fifth is expendable

A perfect fifth is already present in the overtone series of the root, so sounding it adds volume rather than information. Remove it and nothing about the chord's identity or direction changes.

Remove the third or the seventh instead and the chord stops being a dominant: without the third it becomes a suspension, without the seventh a plain major triad. That asymmetry is why every jazz voicing guide starts here.

How to play it

On piano this is the classic shell voicing: C in the left hand, E and B♭ in the right. Everything a pianist adds later — ninths, thirteenths, alterations — is stacked on top of these two notes, never underneath.

On guitar the compact form is x–3–2–3–x–x, sounding C–E–B♭. Comping guitarists in a big band play little else: with a bass player covering the root and a section covering the colour, three notes are already one too many.

Where it belongs

Anywhere a dominant seventh belongs. It resolves down a fifth like any other, appears as the V of a key, and can be altered exactly as freely.

It matters most in dense arrangements. A four-note dominant in the middle of the keyboard fights the bass and the horns; the shell leaves both room, and the listener hears a fuller chord rather than a thinner one because nothing is competing.

Reading it in a chart

Charts rarely print 7no5 — they print C7 and expect the player to decide. The symbol exists for arrangers writing exact voicings and for engraving parts where a fifth would double something already sounding.

Seeing it written is therefore a signal about the arrangement, not about the harmony: someone has decided what the other instruments are doing.

Scales that contain it

Mixolydian fits, as over any plain dominant. Because the fifth is absent from the chord, a melody may lower or raise it without clashing, which quietly widens the choice to include the altered and whole-tone scales.

That freedom is the second reason the voicing is preferred: the fewer notes the chord asserts, the more the soloist is allowed.

Frequently asked questions