In terms of chords and melody, Thomas the Tank Engine Theme Song but Reharmonized is significantly more complex than the typical song, having above average scores in Chord Complexity, Melodic Complexity, Chord-Melody Tension, Chord Progression Novelty and Chord-Bass Melody.
Thomas the Tank Engine Theme Song but Reharmonized is written in the key of C Major. According to the Theorytab database, it is the most common key in all of popular music. See the C Major Cheat Sheet for popular chords, chord progressions, downloadable midi files and more!