Need these song ASAP!

Hey folks, I need some music for a training that I'm doing, but I can't use any download sites at the school I work at. If anyone could just post the links for download here, I'd be very appreciative.

The Songs Are:
1) Say Aah by Trey Songz
2) Party in the USA by Miley Cyrus
3) Tik Tok by Keisha

Thanks folks!