Christ son.... for your song my suggestion is just lay "Apache" over "Happy Birthday" quick solution that should be good enough... as for the 'freezes'...
Don't like mine? Then come up with your own crap... I just wasted like 30 minutes of my life doing this...
P.S. I suggest you practice your ass off for this routine if you want it to be any level of quality, and I also suggest that if you want to do something like this for a girl in the future you A: make sure she's worth it and B: plan it more than 9days in advance.
Good luck homie,
Peace