Usually when a sport needs music the athlete or team plan a routine around a song. Some might choose a song that’s well known in their country but universaly known. If it’s a folk song it might come off as royalty free.

With the breakdancing they had live DJs cutting songs together and the dancers had to adlib their rutines. According to this article the Olympics licensed around 400 songs for the DJs to use. Since each battle used multiple songs you’re going to hear more tracks that you know and forget about the ones you don’t.