Quick. Who's the greatest 1960s guitar hero of them all? Hendrix? Clapton? For my money, it's Michael Bloomfield, the dead Jewish junkie who was so tortured, he had to take heroin just to sleep. When Bob Dylan went electric at the Newport Folk Festival, it was Bloomfield's guitar shrieking out the power chords. Ed Ward's slim 1983 bio has been finally fully fleshed out. 'Michael Bloomfield: The Rise and Fall of an American Guitar Hero' (Chicago Review Press) is a revelation.