>If you haven't yet heard it, it's worth listening to the Lopezes interviewed by Terry Gross on Fresh Air a couple of weeks ago:
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http://www.npr.org/2014/04/10/301420227/songwriters-behind-frozen-let-go-of-the-princess-mythology>
Thanks for the link, I'll listen to it later, thanks.
I did read the interview highlights and one thing that caught my eye was the reference to the musician Tori Amos. When I first heard "Let it Go", the style reminded me of the signature edge that Tori Amos gives to many of her songs.