Fun actor - really good musician.
As a sound junkie, I pay a lot of attention to how people use the microphone. Bruce knows how to do it well and about half-way through, his use of both the vocal and harp mic for singing is excellent technique if the FOH mixer is expecting it. A great effect. The mic in question is an Astatic JT30 dispatcher's microphone. It was designed for 1960's taxi cab dispatchers - the frequency response was limited to vocal frequencies (300-3,000Hz) and it was designed to take a lot of abuse (spitting, shouting, being knocked around, beer, tobacco smoke, etc...) which makes it perfect for the blues.
Hey Bruce - if that acting gig doesn't pan out...