Sometimes music as seemingly simple as Page France’s feels like it’s hardly worth writing about. At the Black Cat on Thursday, the Cumberland, MD six-piece (reigning as the undisputed best indie pop band in western Maryland) played a thirty minute set. Maybe 8 or 10 songs, each one barely more than a hastily-strummed acoustic guitar, a tinkling xylophone, and a simple snare beat. Some songs hardly even had a single chord change for the first…