To say that Buddy Guy is a ferocious blues guitarist is merely a polite understatement. Yes, the Louisiana native has a famously piercing tone and a thrillingly dexterous approach as a guitarist, with the ability to deftly switch from aggressive intensity to soulfully introspective coolness. But the longtime Chicago-blues icon is more than just a talented technician. Guy is an underrated vocalist, but more than anything he’s a masterful showman who can dazzle audiences with a warm, charismatic stage presence as he mixes storytelling, blues standards, his own originals and unexpected covers with a deceptively casual aplomb. Within the space of a few minutes, he can artfully mimic and celebrate the styles of such disparate guitarists as John Lee Hooker, B.B. King and Jimi Hendrix before sending out fiery surges of his own inimitable licks. Also at the Canyon Agoura Hills on Friday, Aug. 10; and at the Canyon Santa Clarita on Sunday, Aug. 12.