Style Blog: Why you should know Idina Menzel's name (even if John Travolta doesn't)

John Travolta may not know "Frozen" star and Broadway veteran Idina Menzel's name (it's not that hard, really), but here are five performances that show why he -- and you -- should know her name. 1. "Defying Gravity," the showstopping number from Menzel's Tony Award-winning performance as Elphaba, the wicked witch, in the original Broadway cast of "Wicked."