Jonathan McNamaraWilliam Elliot Whitmore on stage at Chyro Arts.It's rare to see a fight at a Phoenix show. When that fight is between two girls standing outside a Scottsdale art gallery where they just witnessed a brilliant performance by a banjo-playing bluesman from Iowa? Well, that's just weird.Yes, William Elliot Whitmore's show at Chyro Arts was quite a weird one, but also an amazing evening for what the bearded ex-hardcore kid turned deep-voiced horse farmer called "a broad cross-section