Quiet and extremely unassuming off the bandstand, Hubert Sumlin played a style of guitar incendiary enough to stand tall beside the immortal Howlin' Wolf. The Wolf was Sumlin's imposing mentor for more than two decades, and it proved a mutually beneficial relationship; Sumlin's twisting, darting, unpredictable lead guitar constantly energized the Wolf's 1960s Chess sides, even when the songs themselves (check out "Do the Do" or "Mama's Baby" for conclusive proof) were less than stellar.