The worn floor of an old honky-tonk is not usually a place you’d think of as welcoming to bold new experimentation. If you’ve got something new to say, you’d better say it in the form of a brisk two-step that keeps the dancers moving. So it’s doubly impressive that Seattle country band Western Centuries is able to meld wildly disparate influences into an original honky-tonk sound that won’t make dancers miss a step.