C#sus4 Suspended 4th Chord

The C# Suspended 4th chord contains: C#, F#, G#.

These notes are derived by applying the suspended 4th interval formula (0–5–7 semitones) to the root note C#.

Replaces the third with a perfect fourth.

Classic rock tension before resolution. The C#sus4 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of C# major, it functions as the most stable resting point in progressions.

On piano, play C#, F#, G# simultaneously.

In root position, C# is the lowest note. Inversions move the bass note up — first inversion has F# lowest, second inversion has G# lowest.

A suspended 4th chord has 3 notes: C#, F#, G# (in C#).

It is a triad — the most fundamental chord type.

The C# major chord (C#–F–G#) uses a major third (4 semitones), giving it a bright, happy sound.

The C# minor chord (C#–E–G#) uses a minor third (3 semitones), giving it a darker, emotional sound.

C#sus4 naturally serves as the I chord in the key of C# major.

It also appears as IV in the key of G# major, and as V in the key of F# major.

Yes.

The ukulele uses GCEA tuning with 4 strings. The C#sus4 chord notes (C#, F#, G#) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

In the key of C# major, C#sus4 pairs naturally with F# major (IV), G# major (V), and A#m (vi).

The classic I–IV–V (C#sus4–F#–G#) is the foundation of blues, country, and rock.

An inversion places a non-root note in the bass.

C#sus4 root position: C# in bass. First inversion: F# in bass. Second inversion: G# in bass. Inversions create smoother bass line movement without changing the harmony.

Remember the formula: 0–5–7 semitones from root.

For C#sus4: start on C#, add 5 semitones, then 7 semitones. Practicing this across all 12 roots builds instant recognition of any suspended 4th chord.