At the height of the initial pandemonium, in 1955-56, a select number of front-runners emerged, stars whose personalities and performing antics set the stage for all that was to follow: Elvis, of course; Chuck Berry, whose definitive guitar style (rooted in swing jazz and the uptown band blues of T-Bone Walker) was as widely emulated as his brilliant, vividly economical lyrics of teenage tribulations and triumphs.
By the mid-1960s, rock and roll had developed into "the more encompassing international style known as rock music, ... After the mid-1950s, electric bass guitars and drum kits became popular in classic rock.
