"Defending conceptual thought with regard to a poster for a band is about the most egotistical, big headed thing I can imagine. "
Well, if you can pull off what a band conveys well visually ,then you're a good designer. Thats what Graphic design is, VISUAL communtication. How else would you communicate for someone to go to an aural event than to make something visually stimulating that hopefully grasps the music. That in turn is good design and good advertising...In turn you failed this time, sorry.