How do you harmonize the C# major scale?

To harmonize C# major, stack thirds from each scale degree to build diatonic chords. This produces triads and seventh chords that naturally fit within the key of C# major.

C# major chords

All guitar chords for the C# major scale

Show scale diagram ↓

Chord Voicings

Harmony

Originalii–V–ISec. Dom.

C♯ major scale diatonic chords

IC♯ major

IIE♭ minor

IIIF minor

IVF♯ major

VA♭ major

VIB♭ minor

VIIC dim

C♯ major scale seventh chords

IC♯ maj7

IIE♭ m7

IIIF m7

IVF♯ maj7

VA♭ 7

VIB♭ m7

VIIC m7♭5

scale

Fretboard diagram

C# major scale — chords and intervals

Harmonizing the C# major scale produces the most foundational chord family in Western music. The diatonic chords follow a major-minor-minor-major-major-minor-diminished pattern that has powered countless hit songs. The chords built from C# major are C#maj7, D#m7, Fm7, F#maj7, G#7, A#m7, Cm7b5. The I-IV-V progression is the backbone of pop, rock, and country, while the I-V-vi-IV pattern has become the most popular progression in modern songwriting. Use the ii chord as a gentle pre-dominant and the vii° as a passing tension. Commonly used in Pop, Classical, Country, Folk, Rock. Notable players include The Beatles, Taylor Swift, John Mayer.

The C# major scale has the following degrees: 1 2 3 4 5 6 7.

Intervals: W-W-H-W-W-W-H.

Diatonic chords: C#maj7, D#m7, Fm7, F#maj7, G#7, A#m7, Cm7b5.

Degrees	Chord
I	C#maj7
ii	D#m7
iii	Fm7
IV	F#maj7
V	G#7
vi	A#m7
vii°	Cm7b5

Degree-by-Degree Analysis

The I chord (C#maj7) is the tonic — the gravitational center of the key. The ii chord (D#m7) is the minor subdominant, commonly used to approach the V chord. The iii chord (Fm7) functions as a substitute for the I or vi. The IV chord (F#maj7) is the subdominant — it adds motion and moderate tension. The V chord (G#7) is the dominant — it creates the strongest tension that wants to resolve to the I. The vi chord (A#m7) is the relative minor — it brings emotional color and depth. The vii° chord (Cm7b5) is the diminished — the most tense, rarely used alone, usually leading to the I.

This page focuses on the harmonic content — the chords built from each degree of the C# major scale. For fretboard patterns and fingering guides, see the scale page.

Use the interactive harmonizer above to explore triads, seventh chords, and chord voicings for composing with the C# major scale on guitar.

Related Scales

How to Use This Scale

Use over major triads, Maj7, Maj9, and any diatonic chord within the key. The default choice for major-key songwriting.