I always use Halloween as a chance to discuss minor harmony. I used the door during instruction to also discuss several other musical elements.
Recipe for Spooky Music
Minor Harmony (dissonant chords make your skin crawl)
Unusual Sound Effects (usually from the percussion family)
Subito Fortissimo (suddenly loud)
Musical example: "Skin and Bones"
Accellerando (gradually get faster)
Musical example: "Hall of the Mountain King"
Melody Goes Higher (raising the pitch level increases suspense)
Musical example: Jaws theme
Students in grades 2-5 completed an exit slip before they left class. They completed a sentence "Our music sounded spooky because . . ." I picked a few papers from each class to frame my door. Here are a few student responses
The winners of the door decorating contest have not yet been announced. I'll let you know if my time and effort is rewarded.