TODAY | December 05, 2013
>> we built a whole orange room based on. exactly right.
>> we didn't need to remind everybody about the " sound of music ." tonight all eyes and ears will see carrie underwood . natalie went behind the scenes with the stars. she sees how they plan on pulling this off. the hills are alive with the sound of music
>> reporter: the songs are timeless. a doe a deer a female deer.
>> reporter: tonight 54 years after it opened on broadway, nbc will be alive with "the sound of music ."
>> to the instead can di cam is here.
>> reporter: i got a chance to catch up with the star herself miss carrie underwood . though she's an oklahoma country artist. she says she is a lot like maria.
>> what do you think are the similarities?
>> i didn't grow up in the mountains. i grew up outside and nobody could stop me from singing. people tried. yes, that and obviously i never thought about being a nun. but i am a faithful person and she climbs the trees. that was me. that was me growing up.
>> reporter: it took months of preparation to transform this long island sound stage into prewar austria while underwod worked, a crew of hundreds built the enormous set. with 25 scene changes, there are no second chances. are you worried about mistakes at all?
>> i'm not worried about them, i know they'll happen. somebody will trip or something coming down the stairs, hopefully not fall down the stairs.
>> hopefully not you.
>> not me. people have to walk up the stairs backwards in heels.
>> oh, wow.
>> reporter: coe star steven moyer has a few concerns of his own.
>> this is my von trap balcony. i start exactly where we're standing. i walk down that stairs.
>> that will be leave. that could be calamitous.
>> all of a sudden a camera is in your eye lean. crap, i'm in the wrong place, i have to take step over so this camera can peck me up.
>> reporter: there are 61 cast members selected from over 1,500 who auditioned
>> back stage the busy wardrobe ream. over 207 costumes. recognize these? the beautiful play clothes made from the mansion's curtains. i hear carrie underwood even sewed these herself. she's amazing. with more costumes, the minutes of the show, it's all about the quick change .
>> i think i have like 48 seconds to change my clothes for one scene. we did a test run. we got it done in 22. i'm like, what? people like back stage ripping my clothes off.
>> reporter: one thing underwood has totally under control the singing, even if it involves a bit of yodeling. they said, this is going to be tough. i'm like, i got this one. i have actually been yodeling my whole life. [ music playing ]
>> okay. i am watching.
>> i have a confession, i've never seen the musical. this will be my first time seeing it. i'm going to tweet throughout the entire session.
>> mcdonald, she is mother superior . this is going to be spectacular.
>> i cannot wait. you can catch "the sound of music " live tonight.
>> what do you mean, live?
>> where have you been?
>> didn't they shoot this?
>> this is going to be awesome.
>> it is very live.
>> don't forget -- we will have them performing here live. matt.