"Julie was slightly defensive," Siegel recalls with a chuckle.
"'I can't do that, I don't want to do that! I just want you guys to know right now if that's what you are expecting, I can't do that."'
The redheaded star became interested however, when they suggested she model herself on Alison Mosshart from US-UK indie band the Kills.
"The Kills' music actually connects to a deeper-roots rock 'n' roll and punk sound," explains McGehee. "We got the band interested and had these two songs, Night Train and Hook and Line, and hooked Julie up with our friend, Pete Nashel, who has composed music for a couple of our films and he worked with her and built up her confidence. When we finally shot the concert scene Julie brought so much to it. She was into it."
Moore ultimately sings the songs with the Kills.
As for Skarsgard, the True Blood star wanted to assume a more nurturing pose.
"We were interested in Alex for many of the things that he conveys as Lincoln in the movie - his gentleness, his sympathy," says McGehee. "But when he came to us he said he'd been working out a lot for the show and didn't want to seem muscular. So he brought this slightly hunched-over thing, which worked really well."
What: What Maisie Knew starring Julianne Moore, Steve Coogan, Alexander Skarsgard
When and where: Opens at cinemas Thursday
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- TimeOut