Eighty One (F major) - Jazz Analysis & Chords

Chord Distribution Analysis

No obvious ii-V patterns detected.

Harmonic Highlights

• Utilizes a modified 12-bar blues structure where traditional dominant chords are replaced by 7sus4 voicings, shifting the harmonic language from functional tension to static, modal textures.
• The movement to the IV chord (Bb7sus) and V chord (C7sus) preserves the quartal soundscape by omitting the leading tone and third, creating an ambiguous, open-ended feel.
• Employs a Dbmaj7#11 as a bVI substitution, introducing a Lydian color that provides a sophisticated chromatic departure from the F tonal center.
• The repetitive F7sus to Dbmaj7#11 tag creates a non-functional, oscillating resolution characteristic of the 1960s post-bop era.

Improvisation Focus

F Mixolydian and F Blues scales, with an emphasis on quartal intervals and rhythmic displacement to complement the suspended chord tones.

Difficulty Rating

2/5: The slow tempo and repetitive structure are accessible, though the static “sus” harmony demands rhythmic creativity and melodic restraint to avoid monotony.