Paul Simon and Art Garfunkel were already performing in the NYC area before they were really famous. Until now only dates have surfaced, but with no evidence further at all. To my big surprise if found this one on Tumblr today:
2 pictures of Paul and Art performing at The Bitter End in New York City, October 20th 1964.
I knew that they performed at The Bitter End, but now it seems confirmed!
Paul Simon - 'Time it was...it was' 
Is it known if they appeared under their real names or did they use other names? And do you know who the photographer was?
Could be ” Kane and Garr”. We are hoping for a more definitive answer soon.
Yes, could be. Nice photo anyway