In terms of chords and melody, Yuukei Yesterday is more complex than the typical song, having above average scores in Chord Complexity, Melodic Complexity, Chord-Melody Tension and Chord-Bass Melody.
Yuukei Yesterday has sections analyzed in the following keys: F Major, and E♭ Major. Click on the linked cheat sheets for popular chords, chord progressions, downloadable midi files and more!