The interesting thing from the same interview is the quote directly after the one the previous poster listed:
"Have you ever been able to use it professionally?
SEYFRIED
I've auditioned for roles that involved voice, but I don't like it. I feel like, I can't do this in front of you. It seems so separate — I don't share it with a lot of people. And I'm not into public performances. I'd have to be with a band that played really loud music behind me. I'm also 20 now, and I haven't trained since I was 17."
It looks like she'll have to get over her nerves if this is indeed true.
Tonya Pinkins: Then we had a "Lot's Wife" last June that was my personal favorite. I'm still trying to get them to let me sing it at some performance where we get to sing an excerpt that's gone.
Tony Kushner: You can sing it at my funeral.