In terms of chords and melody, WoW is more complex than the typical song, having above average scores in Chord Complexity, Melodic Complexity, Chord-Melody Tension and Chord Progression Novelty.
WoW is written in the key of E Minor. According to the Theorytab database, it is the 2nd most popular key among Minor keys and the 8th 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 (E minor, A minor, and B minor). See the E Minor Cheat Sheet for popular chords, chord progressions, downloadable midi files and more!