The lovely hughville gave me Caravaggio. This painting is "The Calling of St. Matthew." Back in the late '80s, I used to have a poster that parodied this painting, where the four figures on the left were the Beatles.
To continue this meme: Leave a comment, and I will give you the name of an artist! Please put a painting by that artist in your LJ.
(Google Image is helpful. :) )