"The Banger Sisters" tells of two middle-aged women, once best friend rock groupies, who have taken different paths through life. Upon reuniting after 20 years they rediscover each other and, most of all, themselves. A fun and funny chick flick with summa-dis and summa-dat in lieu of a story, this light hearted comedy runs the gamut from silliness to poignancy to middle-aged romance to sentimental stuff with only an occasional speed bump along the way winding up with a message about being true to yourself. An enjoyable three star flick for more mature audiences, especially the distaff. (B)