C 9th #11 (C9#11) — Complete Guitar Chord Guide Overview C 9th #11 is a dominant chord built on the root C. The notes are C, E, G, Bb, D, F#, following the formula 1 - 3 - 5 - b7 - 9 - #11. This chord is essential for guitarists exploring Jazz, Fusion music and appears in countless songs across multiple genres. The 9th #11 quality gives it a distinctive harmonic character that creates tension and forward momentum. Music Theory The C 9th #11 chord uses the interval formula 1 - 3 - 5 - b7 - 9 - #11, producing the Root (1), Major Third (3), Perfect Fifth (5), Minor Seventh (b7), Major Ninth (9), Sharp Eleventh (#11). The notes C, E, G, Bb, D, F# define its unique sonic footprint. Constructing this chord begins with the C major scale (C D E F G A B). Taking the 1st, 3rd, 5th, and flatted 7th builds the dominant 7th — the tritone between 3 and b7 creates the pull to resolve. Playing Tips For advanced level players, C9#11 requires advanced finger positioning and voice-leading awareness. Explore inversions, extensions, and substitutions to fully exploit the chords harmonic potential. Musical Applications C 9th #11 is most commonly found in Jazz, Fusion, Lydian Dominant music. Typical uses include driving harmonic motion in blues and jazz, creating tension before resolution, and adding color to funk and R&B. Common chord progressions include . Practice Recommendations Start with 5-minute sessions focusing on clean articulation of each note. Gradually increase to 10-minute transition drills with a metronome, then 20-minute arpeggio and rhythm variation practice. At 30 minutes, apply the chord to full progressions at increasing tempos. Record your practice to identify areas for improvement.