Looped music came from Robert Fripp which came from Steven Reich which came from Daphne Orem which came from Edwin Votey which came from ... But if you think about it, who was the first to serve the new music to a large audience and have it documented and then commoditize it is where i think the notion of "first" really comes from. It's like trying define the exact day that Boomers became Gen-X in the US: broad strokes make sense, but resolution is only so fine.