Rock n' roll legend Chuck Berry, 84, has collapsed live on stage during a performance in Chicago. Reportedly, he slumped over his keyboard and lay motionless for a few minutes before being helped off stage. Later, he re-emerged and apologised to fans, saying that he had no strength to continue.

Berry was a pioneer of early rock n' roll, heavily influencing The Rolling Stones in their early days. Keith's style of guitar playing is heavily derived from Berry's.