Dominant seventh chord (7) on cavaquinho
C7 is the dominant seventh chord: C, E, G and Bb (1–3–5–b7). On cavaquinho, the diagram shape is 2 3 1 2, with E in the bass.
On the cavaquinho, four steel strings tuned D–G–B–D pack the chord into a small, bright space — every finger counts. In this C7 voicing the bass is E and the shape runs from fret 1 to 3. Its four steel strings give a bright, sharp attack that cuts through the mix and drives the beat.
C7 on cavaquinho: shapes and notes →
Notes and formula of C7
Notes in C7: C – E – G – BbFormula: 1 – 3 – 5 – b7In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
Where to use it
Dominant, blues and any point of strong resolution.
See also
Part of the Sevenths family.