My favorite Eno essay, which also touches on similar themes, is "Composers as Gardeners".[1]

In the "Generative Music" essay, Eno mentions being influence John Cage. For a closer look at his thought, I highly recommend his book "Silence".[2]

[1] - https://www.edge.org/conversation/brian_eno-composers-as-gar...

[2] - https://www.amazon.com/Silence-Lectures-Writings-50th-Annive...

True, "Silence" is actually a book: http://www.amazon.com/Silence-Lectures-Writings-Anniversary-...