The C7 chord
The C7 chord is tense in the most useful way. Its notes (C - E - G - A#) form a dominant seventh, which is why it shows up across the twelve-bar blues and gospel turnarounds. Songwriters pick the C7 when they want forward motion, and on guitar it sits naturally where most players already park their hand. The grease on the wheels of every twelve-bar blues that starts on C. The voicings, theory, progressions and song references that follow are organised so you can skim once or settle in for the full picture.
Hear the C7 in the chord builder →Voicings for C7
Common ways to grip the C7 on guitar and piano. Guitar diagrams read low E to high E left-to-right; an × means muted, an open circle above the nut means an open string. Filled dots are fretted notes.
Guitar , full chord shapes
CAGED-derived voicings for C7 across the neck. Pick the shape closest to where your hand already sits.
Guitar , triad shapes
Three-note triad shapes on each string set, shown moving up the neck. Light textures for arpeggios, pop layering and chord-melody work.
Piano voicings
Root position and inversions. The bass note matters: each inversion changes how the chord sits under a melody.
The theory behind C7
Progressions that use C7
Short progressions that put the C7 to work. Each one is shown in a different key so you can pick the one that suits your singer.
This chord appears as a borrowed or passing chord in many major-key progressions.
→ Build this in the chord builderSongs that feature C7
Real records where this chord does structural work. No lyrics quoted, just the title and artist so you can pull up a copy and hear it in context.
- Blue Suede Shoes by Carl Perkins. C7 in the classic twelve-bar form.
- Hound Dog by Elvis Presley. C7 as a turnaround chord.
- Johnny B. Goode by Chuck Berry. C7 powering the blues form.
Related chords
Chords a step away from the C7 in the songwriting circle, the natural neighbours when you want a substitution.
Keys where C7 lives
The keys where this chord turns up diatonically. Open any key page for the full set of progressions that lean on it.
Related references
Other ways to put the C7 to work across the reference library.
More songwriting tools
Got the chord but still wrestling with the lyric? Find the right rhyme in RhymeForge, or break a writer's block with the unexpected word-pair generator in CollisionLab. Need to map a full progression? The chord builder on the home page is where the C7 fits into context. All free, no signup.
About the chord builder
The Undercover Zest chord progression builder is a free interactive tool that maps every diatonic and borrowed chord in every key. Click a Roman numeral to hear it, drag chords into a progression, then audition voicings, inversions and tensions until the song clicks.
This page is a static reference for the C7. For interactive playback, voice-leading hints and substitution suggestions, open the chord builder above.