If the Butterfield Blues Band’s groundbreaking debut earned the respect of the group’s elder influences, this one won over (and guided) the blues boys’ psychedelic peers. Highlighted by the 13-minute-plus title track (an Eastern-influenced jam cowritten by guitarist Mike Bloomfield), East-West stretches the boundaries of the blues. It would prod many lesser groups to explore, with generally dreary results, interminable free-flight explorations. But while East-West and a cover of jazzman Cannonball Adderly’s “Work Song” ventured in new directions, Paul Butterfield and company remained rooted in solid Chicago blues. East West presents the best of both worlds.