Photo As Seen On http://www.robertrandolph.net/gallery Music is like food.  You've got your good, wholesome, organic music, and then you've got your bad artificial prepackaged garbage -- loaded with fillers.  Good music is sustaining and nutritious to the body and soul, while bad music leaves you unsatisfied and malnourished.  So what exactly am I getting at?                                           We (we being my sister and I)  took the train up to Portland Maine on Saturday to see Robert Randolph & The Family Band perform at the Port City Music Hall , and was curious as to how their live performance would fare.   But first, before any proper meal is consumed, one must set the table.  Port City Music Hall, stylish and industrially chic,  creates an intimate ambiance and provides a functional slab for performers to roll out their dough.  Shortly after arriving and throwing back a bottle of local ale, we made a b-line to the front of the room and