I dont think anyone recorded any song in one take (except live albums). A lot of production goes into it and layers of sound and backing tracks are added. Led Zep were no exception and that is why most of the groups in the 70s and 80s sounded very different live as they did not have the technology available now to layer sounds even in a live performance (so dont get surprised if in a Oasis concert you hear a clarinet when there is no player on stage...its all a recording being played back)