Riley, Terry - In C (remastered)
The classic early 1960's recording of what could definitely be considered the 'grandaddy' of systems music. A very simple score of a number of small musical cells, each numbered. All the musicians start at the same point, but each is free to move onto the next cell whenever they like, as long as they have completed playing each cell all the way through. Thus, the interlocking patterns are completely arbitrary and the possibility of combinations enormous.