Heralded as one of the greatest live blues albums ever recorded, this set catches B.B. King as his star was in ascent: in 1964 playing Chicago's answer to Harlem's Apollo Theatre—the Regal. King's performance is visceral. He sings so hard that gravel flies even in his clearest high notes. And his trademark single-note guitar lines are sharp and steely, matching his voice with trembling vigour.

He offers early hits like "How Blue Can You Get," "Worry, Worry," and "You Upset Me Baby" to what's essentially his adopted hometown crowd (by his own account, King had already played the theatre hundreds of times). They give him a hero's welcome. In fact, the audience's screaming enthusiasm is distracting. But rarely has a love-fest of this magnitude between a performer and fans been documented.