Presented in a documentary style, this drama looks at the life of the fictional jazz guitarist "Emmet Ray" (Sean Penn). Now, of course, he is American so is naturally the best in the whole wide world, well second best actually, and that is testified to by frequent obsequious pieces-to-camera from purported experts and then by his own performances as he plays standards from the likes of Django Reinhardt, the masterful Stéphane Grapelli and Duke Ellington. Director Woody Allen has a penchant for this style of music, and as faux-homages go this isn't at all bad. That's really thanks to a strong…