As the exuberant frontman for the boundlessly imaginative Brit-pop group Supergrass, Gaz Coombes at one point seemed to be an eternal teenager -- a man destined to never slow down. But time has a way of aging even the irrepressibly youthful, and by their second decade Supergrass had started to expand sonically; by the time he released his solo debut, Here Come the Bombs, in 2012, just two years after the disbandment of Supergrass, Coombes had eased into the role of something of a Brit-pop elder statesman: a pop songwriter who was ready to explore new territory without swearing...