This Nathan person is dumb enough to post this here but smart enough not to claim it as his own by listing his name as designer. This is the rest of his work:
It would be more upsetting if a designer was actually trying to take credit for it. That doesn't seem to be the case here. This is more like, venue employee needed poster art on the fly... trace existing cool art... done.
http://www.gigposters.com/designer/94492_Nathan_Coyle.html