This is my opinion, but playing some certain NIN songs for anyone that is not old enough to understand it is not the best idea. NIN is not simple pop music, but has dark lyrics and themes that need to be explained to a young child. I would never play something like Closer to a child younger than 10 or so. Downright irresponsible if you ask me. Don't get me wrong, a lot of the music would be appropriate, however playing TDS all the way through? No way.