In terms of chords and melody, East District 439 - Buu's Fury has complexity on par with the typical song, having near-average scores in Chord Complexity, Chord Progression Novelty and Chord-Bass Melody and below-average scores in Melodic Complexity and Chord-Melody Tension.
East District 439 - Buu's Fury is written in the key of C♯ Minor. According to the Theorytab database, it is the 9th most popular key among Minor keys and the 21st most popular among all keys. Minor keys, along with major keys, are a common choice for popular music. The three most important chords, built off the 1st, 4th and 5th scale degrees are all minor chords (C♯ minor, F♯ minor, and G♯ minor). See the C♯ Minor Cheat Sheet for popular chords, chord progressions, downloadable midi files and more!