A Broadway performance of “Legally Blonde” is being broadcast on MTV. “Admittedly, securing that much airtime on MTV isn’t quite the seal of zeitgeist approval that it would have been 20 or even 10 years ago. MTV has strayed from the actual music business, now retailing lots of reality TV (and not the fun kind). But to have a Broadway musical reach a nationwide audience behind an MTV logo seems a big deal indeed.”