Tres Cubano Scale Harmonizer
Triads & 7th chord diagrams for every scale — tres cubano GCE tuning
C major scale diatonic chords
IC major
IID minor
IIIE minor
IVF major
VG major
VIA minor
VIIB dim
C major scale seventh chords
IC maj7
IID m7
IIIE m7
IVF maj7
VG 7
VIA m7
VIIB m7♭5
Secondary Dominants
V7/IG 7
IC major
V7/IIA 7
IID minor
V7/IIIB 7
IIIE minor
V7/IVC 7
IVF major
V7/VD 7
VG major
V7/VIE 7
VIA minor
V7/VIIF♯ 7
VIIB dim
C major — Tres Cubano scale
Tres Cubano fretboard diagram
Standard (Open C) (GCE)
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How does the Tres Cubano Scale Harmonizer work?
The Cuban tres is an instrument of Cuban music with 3 double-string courses (bordón and prima). Its standard tuning is G-C-E (GCE), equivalent to the three bass strings of the classical guitar.
Select a root note and a scale to see all diatonic chords — triads and sevenths — with chord diagrams for every position on the tres cubano fretboard.
Use the interactive fretboard diagram to visualize the full scale. Adjust tuning (Open C, Havana Open D, Modern) and fret count with the controls.