C7 electric guitar chord

C7 (C seventh) is built from C, E, G and Bb, the degrees 1–3–5–b7. On electric guitar, the main shape is x 3 2 3 1 0, the first diagram, marked with the star.

Say this out loud: "one, two..." — and stop right there. Uncomfortable, isn't it? The sentence is hanging. That discomfort has a sound: C7 is a sentence without a period. Hit play below.

Hear C7 before you play

Why C7 sounds this way

Why does it sound unfinished? Inside C7, two notes are at odds: E and A#. Now listen to the arpeggio, one note at a time and catch the second and the last note — the distance between them is the tritone, one of the tensest intervals in tonal music. C and G keep the house standing while those two argue inside it. And an argument, you know, demands a resolution.

How to play C7 on electric guitar

On the electric guitar a chord needs only a few clear notes — the amp sustains them and fills the space, so you mute the strings you are not playing and let the tone carry the rest. So grab the first position below — 1 open string to help you; it's the main shape — that's why it carries the ⭐. Now the experiment that explains this chord better than any explanation: play C7, hold it for one breath, then play F. Felt the door close? Do it again. That relief is the dominant's job.

Precision Tuner: Get in tune before you play: chromatic tuner and reference tones, free in standard tuning · see it in Chord and Fret

The other positions earn their keep in blues and jazz, where this chord is practically the official language; learn them one at a time.

C7 notes and degrees

C7 stacks the root C, the major third E, the perfect fifth G and the minor seventh Bb.

Where C7 shows up

Its most common job is the dominant, and dominants live as VII7 in D minor, V7 in F major. Translation: wherever it shows up, the music is usually about to move. In the blues, though, C7 can also be the home chord. A chart full of 7th chords is a song that won't sit still.

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Where C7 usually goes

When C7 works as the dominant of F, it tends to resolve to F or FmFmFmFm. In other contexts the sequence changes: in the blues, C7 can be the home chord itself. Typically, not a rule.

Going beyond C7

For soloing, C Mixolydian (C D E F G A Bb · 1 2 3 4 5 6 b7: the major scale with a lowered seventh — the blues accent); C Lydian dominant (C D E F# G A Bb · 1 2 3 #4 5 6 b7: a mixolydian with a raised fourth: the dominant in formalwear) cover the whole chord. And look at the first swap on the list below: that's the famous tritone substitution, the twin dominant living three whole steps from here, the one arrangers reach for when they want to arrive at the same place by a prettier road.

Scales to improvise over C7

The C Mixolydian scale is a common choice over C7: it contains every note of the chord. The best fit depends on the key, the surrounding chords and the tensions you want. When C7 moves to F, its third, E, is the leading tone of F: the note that wants to rise a half step.

Swaps that work:

• Gb7Gb7Gb7Gb7 — Tritone substitution (shared 3rd–7th tritone)
• Gm7Gm7Gm7Gm7 — Forms a II–V: precede with this ii
• Dbdim7 — Passing diminished (ascending)

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C7 jazz voicings

Jazz Lab: Drop 2 voicings in any key, free; drop 3 and shell are part of Pro · use it in Chord and Fret

You already know how this sentence usually ends. As a dominant, the period after C7 is F — go there and close it with your own fingers.

Updated October 20, 2026