Part of their vision came true. Music did indeed come to be made by machines. What they didn't get right: the kind of machines that would make it.
In fact, the Italian Futurists of the early 20th century had something quite different in mind. What they imagined weren't exactly the iPods or synthesizers of today but rather something more like the Intonarumori devices headed this week to the Cleveland Museum of Art.
Source: http://www.cleveland.com