Remember The Sound Effects Guy From Police Academy, He’s The Real Thing
Remember Michael Winslow, the guy that could do all the sound effects in the movie Police Academy? He is the real thing, I have seen many performances of his talent to be able to copy sounds, leading me to believe that he really did all those sounds in the movie.
Here's a performance of Led Zepplin
This one he voices a Star Wars movie with all the sound effects and voices.