C 7th Sus4 #5 (C7sus4#5) — Complete Guitar Chord Guide Overview C 7th Sus4 #5 is a altered chord built on the root C. The notes are C, F, Ab, Bb, following the formula 1 - 4 - #5 - b7. This chord is essential for guitarists exploring Jazz Fusion, Modern Harmony music and appears in countless songs across multiple genres. The 7th Sus4 #5 quality gives it a distinctive harmonic character that provides sophisticated color. Music Theory The C 7th Sus4 #5 chord uses the interval formula 1 - 4 - #5 - b7, producing the Root (1), Perfect Fourth (4), Minor Sixth (b6), Minor Seventh (b7). The notes C, F, Ab, Bb define its unique sonic footprint. Constructing this chord begins with the C major scale (C D E F G A B). Stacking thirds beyond the seventh adds upper tensions. Playing Tips For advanced level players, C7sus4#5 requires advanced finger positioning and voice-leading awareness. Explore inversions, extensions, and substitutions to fully exploit the chords harmonic potential. Musical Applications C 7th Sus4 #5 is most commonly found in Jazz Fusion, Modern Harmony music. Typical uses include adding sophisticated harmonic color in jazz, fusion, and contemporary contexts. 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.