Let's see... Gotta put in a perennial favorite of mine. Still gets stuck in my head to this day... and I'm one of those odd people who actually liked this movie's soundtrack:
Also really love Hellfire from Hunchback in terms of a villain song. Incorporating songs from the Catholic mass into that song just made the guilt that much better, heh:
I would argue for For the First Time in Forever (Reprise) from Frozen, but that's only because I love counterpoint duets and Disney's sort of lacking in that department.