Notes in C♯11
The C♯11 chord contains 6 notes: C♯, F, A♭, B, E♭, F♯
Intervals
| Interval | Semitones | Note | Function |
|---|---|---|---|
| R | 0 | C♯ | Root |
| 3 | 4 | F | Major 3rd |
| 5 | 7 | A♭ | Perfect 5th |
| ♭7 | 10 | B | Minor 7th |
| 9 | 2 | E♭ | Major 9th |
| 11 | 5 | F♯ | Perfect 11th |
About C♯ Dominant 11th Chords
Dominant 11th chords extend the 9th with an 11th (4th up an octave). In practice, guitarists often omit the 3rd to avoid a half-step clash with the 11th. The result is sometimes indistinguishable from a 7sus4 voicing.
Compatible Scales & Modes
These scales contain all the notes of C♯11 and can be used for soloing, improvising, and writing melodies over this chord.
EXPLORE MODES
Playing C# eleventh on Guitar
The C# eleventh chord, spelled C♯, F, A♭, B, E♭, F♯, occupies a specific harmonic role that depends on the musical context. In the key of Db major enharmonically, this chord can function as a primary harmony or as a passing color depending on where it appears in the progression. Understanding which scale degrees produce C#-rooted chords helps you predict chord progressions and improvise melodies that complement the harmony.
On guitar, C# eleventh voicings benefit from fourth-fret barre shapes that provide a bright, cutting tone. The physical shape of this chord on the fretboard determines its tonal character — the same notes arranged in different voicings produce noticeably different sounds due to string gauge, fret position, and overtone content. Experiment with playing C# eleventh in multiple positions to find the voicing that best fits the register and texture of the music you are working on.
C#11 pushes harmony to its upper extensions, creating a dense, complex sound. On guitar, full C#11 voicings require omitting some notes — the third and fifth are typically dropped in favor of the root, seventh, ninth, and eleventh for a more open, usable shape.
When practicing C# eleventh, use the compatible scales listed above to improvise melodies and riffs. Start by playing the chord, then explore the scale tones one at a time to hear how each note sounds against the harmony. This ear training exercise connects your theoretical knowledge of C#-rooted chords to practical musicianship skills that improve your playing across all genres and styles.