In terms of chords and melody, Chemical Reaction has complexity on par with the typical song, having near-average scores in Chord-Melody Tension and Chord-Bass Melody and below-average scores in Chord Complexity, Melodic Complexity and Chord Progression Novelty.
Chemical Reaction has sections analyzed in the following keys: F♯ Minor, C♯ Minor, and E Major. Click on the linked cheat sheets for popular chords, chord progressions, downloadable midi files and more!