Please! I can think of two or three Stephen Schwartz songs "Defying Gravity" sounds like. ("Up to His Old Tricks" and "West End Avenue" come immediately to mind.) Also, "On the Right Track" from PIPPIN sounds a lot like "Turn Back, O Man" from GODSPELL.
Jule Styne once pointed out that "Why God, Why" from MISS SAIGON stole some of its melody from "There's a Small Hotel" from ON YOUR TOES.
Praying Decca Broadway will put "Don't Bother Me, I Can't Cope" on CD!