You may recognize the song from the 1992 animated movie on which this new musical, which opened Thursday at the New Amsterdam Theatre, is based. In the film version, Friend is sung by Robin Williams, voicing the role of the genie who comes to our titular hero's aid, at his most breathlessly ebullient. It's an act that would be impossible to reproduce, so Iglehart, abetted by director/choreographer Casey Nicholaw, simply tops it. By the end of the number - which includes a game-show segment, a medley of tunes from other Disney musicals and a succession of winking, twinkling chorus lines - Iglehart's Genie is deliriously huffing and puffing; the audience, which responded at a recent preview with a standing ovation, is just as giddy. If Disney Theatrical's latest production doesn't sustain that frenzied high throughout, it delivers a rush that may surprise folks who attend either as chaperones or to relive their own youths.