http://www.wmin.ac.uk/~clemenr/covers/covers.html
This is one of those pages that confirms that you can find information on virtually any subject on the Web. This page actually attempts to name all the artists that ever played a Beatles song. The list includes hundreds of big names -- Sting, Frank Zappa, Frank Sinatra, and Otis Redding, and many more. The information is presented in a straightforward table format.