In terms of chords and melody, Promise is more complex than the typical song, having above average scores in Chord Complexity, Melodic Complexity, Chord Progression Novelty and Chord-Bass Melody.
Promise has sections analyzed in the following keys: D Minor, A Minor, C♯ Minor, and B♭ Minor. Click on the linked cheat sheets for popular chords, chord progressions, downloadable midi files and more!