By Denny Dyroff, Entertainment Editor, The Times Coco Montoya There are various generations of blues artists and they span a really large age range. On October 26, Coco Montoya, one of the country’s best modern blues guitarists, will headline a show at Kennett Flash (102 Sycamore Alley, Kennett Square, 484-732-8295, http://www.kennettflash.org). Montoya has built a reputation as an ace guitarist...