Ray Benson’s nightclub opened at a time when the West Sixth Street stretch was reeling from the 2010 closing of Momo’s and thus helped quell fears of the death of live original music on the upscale side of so-called Dirty Sixth. The Rattle Inn offers the songwriting appeal Momo’s carried, but leans more toward country and western. One would expect that from the man who steers Asleep at the Wheel. An upstairs deck and whiskey lounge off to the side makes it easy to grab some respite after a few songs’ worth of dancing. (