Well really its all about what music makes you pumped up for your routine. Try not to use peoples old music. I know in the past my instructor gave me this song that I loved and I didn't know that Hyper pro Matt Emig already used it. If you find someone who use to use a song that you love but they haven't used in a few years ask their permission first. I know I use tons of oldies songs because they're fun and I plus my judges like them.