I Guess I'll Have To Change My Plan (C major) - Chords Analysis

Chord Distribution Analysis

Key Patterns Detected

Harmonic Highlights:

• The progression heavily relies on diatonic movements, featuring classic I-vi-ii-V and iii-vi patterns, firmly establishing the C major tonality.
• A sophisticated D13 chord (V/V) introduces a momentary dominant tension, resolving unexpectedly to Dm7 before the primary ii-V-I in C, creating harmonic interest.
• The Gm7-C7 progression provides a brief ii-V movement to the subdominant (F major), a common jazz reharmonization technique.

Improvisation Focus: C Major scale and its diatonic modes (Dorian, Mixolydian) applied over the ii-V-I progressions.

Difficulty Rating: 3 (Intermediate). The core harmony is accessible, but the specific reharmonizations like D13 and the ii-V to the subdominant require nuanced improvisational choices.