By Denny Dyroff, Entertainment Editor, The Times The Joy Formidable If you’re a Cambrophile living in this area or a fan of the Welsh National Football Team, you have plenty to be happy about right now. On October 27, The Joy Formidable, one of the best bands to come out of Wales in the last two decades, will be headlining a show at Underground Arts (1200 Callowhill Street, Philadelphia,http://undergroundarts.org). On...