Voted Beatles.
A while back PBS did a special called John Lennon's Jukebox. I really enjoyed it! They also released a compilation CD by the same name. The one thing I will always remember for it was them talking about a Gary "US" Bonds song called Watch Your Step. When I heard it, there is a riff that Led Zepplin directly lifted. I can't recall the name of the Zep song. Anyways, it showed me the back and forth between American artists influencing English artists which in turn influenced American artists.
http://www.pbs.org/wnet/gperf/shows/lennon/index.html
PS: Sitting here watching SNL and Frank Ocean just ended his song by playing an arcade game while John Mayer played a guitar solo. We've come a long way baby!
