A slew of albums by young white men out of their minds in love with music made by older black men came from both sides of the Atlantic during the mid-1960s, but two records really laid the groundwork for the decade´s blues revival--the self-titled releases by John Mayall´s Bluesbreakers out of London and the Paul Butterfield Blues Band out of Chicago. Both bands were led by harmonica-blowing vocalists; both featured ascending guitar gods--Eric Clapton with Mayall and Mike Bloomfield with Butterfield. Butterfield´s ensemble, however, came of age closer to the roots of the music. The rhythm section heard on the group´s 1965 debut was hired away from Howlin´ Wolf, and Butterfield, while still in his early 20s when the album shipped, was already a familiar face on the Windy City´s club circuit. "Born in Chicago" opens the album on a gritty note that never flags through this 11-track landmark. The slashing duo guitars of Bloomfield and Elvin Bis