C#m9 Minor 9th Chord

The C# Minor 9th chord contains: C#, E, G#, B, D#.

These notes are derived by applying the minor 9th interval formula (0–3–7–10–14 semitones) to the root note C#.

Minor 7th chord with an added 9th.

Rich texture used in neo-soul and R&B. The C#m9 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#, E, G#, B, D# simultaneously.

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

A minor 9th chord has 5 notes: C#, E, G#, B, D# (in C#).

It is an extended chord with 5 or more notes.

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#m9 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#m9 chord notes (C#, E, G#, B, D#) 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#m9 pairs naturally with F# major (IV), G# major (V), and A#m (vi).

The classic I–IV–V (C#m9–F#–G#) is the foundation of blues, country, and rock.

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

C#m9 root position: C# in bass. First inversion: E in bass. Second inversion: G# in bass. Inversions create smoother bass line movement without changing the harmony.

Remember the formula: 0–3–7–10–14 semitones from root.

For C#m9: start on C#, add 3 semitones, then 7 semitones, then 10 semitones, then 14 semitones. Practicing this across all 12 roots builds instant recognition of any minor 9th chord.