When Lonnie Mack sang the blues, country strains were sure to infiltrate. Conversely, if he dug into a humping rockabilly groove, strong signs of a deep-down blues influence were bound to invade, par for the course for any musician who cited both Bobby Bland and George Jones as pervasive influences. Fact is, Mack's lightning-fast, vibrato-enriched, whammy bar-hammered guitar style influenced many a picker, too, including Stevie Ray Vaughan, who idolized Mack's early singles for Fraternity and later co-produced and played on Mack's 1985 comeback LP for Alligator, Strike Like Li...