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