The Rebel Black Dot Hallowe'en Song of the Day
Le Pigbat, "Monsieur Hyde" from The Aquabats! and Horchata Records Present… Rice Capades Music Sampler, Vol. 1 (Captain Thumbs Up!)

Commentary: I have 'til next Hallowe'en (or the parties the preceding weekend) to figure out how to be costumed as Dr. Henry Jekyll early in the evening & as Mr. Edward Hyde later that same evening.

Most of the lyrics of "Monsieur Hyde" are in French (not necessarily correct French), but in English the girls do say over & over again:

"Hello, Doctor Jekyll…"