Meditating in Rhythm

Today, I meditated for 30 minute this morning (sitting) and another 30 minutes or so walking. I just meditated another 20 minutes, but decided to try it while listening to music (Lord Huron, thanks Brian!). This time, as I sat in my meditation pose, I noticed that my body was rocking to the beat, inexplicably. It was completely unconscious, and I could just observe it happening. As one track ended, it would stop, and as a new song started, it would begin again. It was a joy to experience. Apparently, there is some rhythm buried within me!