Many years ago, Brian Eno popularised the term "generative music" to describe music that is ever-different and changing, and that is created by a system. Let me introduce you to Nodal, a generative software application for composing music designed by Peter Mcilwain.

Nodal uses a novel method for the notation and playing of MIDI based music. This method is based around the concept of a user-defined graph. The graph consists of nodes (musical events) and edges (connections between events). You interactively define the graph, which is then traversed by any number of players who play the musical events as they encounter them on the graph. The time taken to travel from one node to another is based on the length of the edges that connect the nodes.

Nodal is a freeware for Mac OS X.

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