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 lose his baby fat and 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 and, 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 off his allegiance to melody.