Sorcha, I think rather than just shouting 'balls' it might be more interesting to understand JK's motivation and then argue a case for or against it. As I understand it, JK is arguing the case here for music to dance to, rather than sessions that I think Vixen is asking about. Also, I've heard JK talk elsewhere of the hypnotic or trance-like state exploring a dance tune played over and over again can bring, and by so doing new dimensions present themselves - as he says in this article.