"...the direct result of my work in 1965-66 on two identical audio loops played simultaneously on two separate tape recorders... Over the course of several months, Art Murphy and I – by first working at home playing against tape recordings of our own performance, and then playing on two pianos – found that, while we lacked the perfection of the machine, we could give a good approximation of it and we got to like this totally new and particularly satisfying way of playing, which was completely worked out in advance and eliminated the necessity of actually reading a score. The result was that we became totally absorbed in listening while we were playing the piece."