In 1995 whilst working with SSEYO's Koan software (built by Tim Cole and Pete Cole who later evolved it to Noatikl then Wotja), Brian Eno used the term "generative music" to describe any music that is ever-different and changing, created by a system.
Koan was SSEYO's first real-time music generation system, developed for the Windows platform.
Eno's early relationship with SSEYO Koan and Intermorphic co-founder Tim Cole was captured and published in his 1995 diary A Year with Swollen Appendices.
Steve Reich's It's Gonna Rain and Terry Riley's In C are examples of this (Eno 1996).
An example of this technique is Joseph Nechvatal's Viral symphOny: a collaborative electronic noise music symphony[1] created between the years 2006 and 2008 using custom artificial life software based on a viral model.