The Real Folk BluesPart of Chess' long line of introductory blues compilations, Sonny Boy Williamson's Real Folk Blues keeps up the high standard with another solid batch of classic Chicago blues. Mostly taken from his last years in the first half of the '60s, the 12 cuts here represent some of the best of Williamson's juke joint and dancefloor friendly mix. Helping out this fine harp player are such Chicago royalty as Willie Dixon, Robert Lockwood Jr., Fred Below, and