Why and how did this happen?

I turned on my car and classical ballet music started playing. My ipod was plugged into the speakers and the setting on the cd player/radio would only allow music from my ipod to play. I didn't recognize the piece of music and I could also hear the pointe shoes hitting a wooden stage. I decided to check to make sure it wasn't on a classical radio station, so I changed the setting to the radio. The station that was on was a "80's, 90's and now" music, and it was in the middle of a song, so it's not like it was playing classical. What do you think happened? I am a ballerina, so could that have something to do with it?