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KSDK – This holiday season, a man known for playing a gentlemanly vampire and a country princess will make the hills come alive with the sound of music.

Carrie Underwood is set to play the iconic role of Maria in NBC's live production of "The Sound of Music." And while she's used to singing live, some of the musical numbers – like "Do-Re-Mi" – have proven to be a unique challenge.

"It's not just a song, it's an event," she said. "And we stop in the middle of it, we have dialogue, we run up the stairs, run on the terrace. There's a lot of running and singing at the same time.

"[It's] not something I'm used to, so at the end I'm like (gasp) oxygen!"

"True Blood's" Stephen Moyer plays Captain Von Trapp. While he has a musical theater background, he hasn't sung live for 18 years. Nevertheless, he says he welcomes the challenge.

"No one has done it before, but it's exciting, it's a challenge, that's what it's all about," he said.

The live, three-hour production is based off of the musical version of the "Sound of Music," so expect to see things you didn't see in the classic film starring Julie Andrews.

It airs on NewsChannel 5 on Dec. 5 at 7 p.m.

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