Phil Spector is generally considered to be the first producer to fool around with the concept of soundscapes. He pioneered the idea of the wall of sound, in which every frequency band in the audible range was represented by some sort of instrument. This supposedly led to some great work. However, the only example I can think of offhand is his horrible project with Leonard Cohen, Death of a Ladies' Man, which implements less a wall of sound than a Boschian tableau of it.