RIP, Tony Sheridan. http://www.nytimes.com/2013/02/18/arts/music/tony-sheridan-singer-backup-up-by-the-beatles-dies-at-72.html?_r=0&adxnnl=1&adxnnlx=1361192781-UKJC//AlajYiBiw6c4lUGw
For fans of the very early Beatles recordings. The Beatles From Cavern To Star-Club: The Illustrated Chronicle, Discography & Price Guide 1957-1962. By Hans Olof Gottfridsson, 1997. 480 pages with bonus vinyl EP. http://www.rarebeatles.com/cavbk.htm