Birth of Rock 'n' RollBy: Peter Guralnick In Memphis, Tennessee, in the 1950s, there was hard edged blues playing on Beale Street, and hillbilly boogie on the outskirts of town. But at Sam Phillips Sun Records studio on Union Avenue, theres something different going on a whole lotta shakin, rockin, and rollin. This is where rock n roll was born. Sun Records: the company that launched Elvis Presley, Jerry Lee Lewis, Johnny Cash, Roy Orbison, and Carl Perkins. The label that