Playing the music at that volume = too quiet to feel the power of the music, yet just loud enough to distract from what he's saying. Doesn't add anything to the interview at all. Either cut the background music out entirely, or play samples of the individual tracks as they're being discussed at a very low volume.
instead of playing one song throughout the entire interview, you could have played the one song he was talking about. Other then than, I enjoyed it very much