There are plenty of theories as to why "Wicked" hit the sweet spot. One could argue that we all self-define as either the green girl (alienated, misunderstood) or the blond girl (popular, misunderstood) in our minds. One might note the show's popularity with a youthful demographic that likes to go back again and again. One might further note the truth that comedies like "The Book of Mormon" are less than ideal for repeat business (you've heard all the jokes the first time) but that emotional, bonding experiences like "Wicked" are enjoyable on multiple visits. One might observe the formidable stickiness of the Schwartz melodies or the uncommon wit and savvy of the Holzman book. For sure, the emotions in songs like "For Good" are unusually accessible.