In the summer of 1966 Clapton left the Bluesbreakers, partnering off with sometime Bluesbreaker Jack Bruce to form Cream. Mayall did not look back, re-employing East London guitarist Peter Green, who had previously filled in for Clapton. Undoubtedly equal to Clapton, with a marked difference in style, Green's signature sound enlivens 1967's A Hard Road. Hughie Flint had been replaced by Aynsley Dunbar on drums, and the trademark take on Chicago blues became heavier.