AWA uses very quiet runway music. You can't used prerecorded stuff ^.^;;;
However, NDK DOES in fact allow for this. You get a 45 second clip of music. Keep in mind that they start the music as soon as they call your name and series... it takes approx 9-12 seconds to get up the ramp onto the actual stage. About 14 for a large costume (Out of all the entries last year, I took 3rd longest to get on stage XD)
Why yes, I am a little obsessed.