Unfortunately, when he moved to California he became acquainted with the person who provided LSD and mescaline to many of the Rock stars. From this, he became paranoid and had other mental issues. B.B. King said when Peter Green played the Blues, it would send shivers up his spine, he was that good. Green, Fleetwood and McVie left the John Mayall Blues band to form Fleetwood Mac in 1967.