Phil Spector created the Wall of Sound by recording layers of instruments on top of each other...he also used massive doses of reverb...that's a pretty simplistic way of describing what he did, but actually it WAS pretty simple, it's just that nobody had thought of it before....now to get that sound, there are things that can be added to his concept, like doubling...and using other effects along with reverb....of course, yer ears have to be yer guide..things can get pretty muddy when over-effected....just experiment....gibs