Unit 10 Millenium script

I've been searching for millenium or new year party celebrations and found only one that would be suitable. It is about 13 minutes long but can be looped and mixed etc however the sound probably wouldn't be clear enough for the stage so I think recordings will have to be made of people chatting and laughing etc and then mix that with music. Does the party music have to be composed? Will it be copyright to use chart music? We could ask the music department to make some simple dance tracks and what about Auld Lang Syne? 12am clock chimes are easy to do and I'm happy to mix all these! Opinions?