There are times when a song or a phrase, a picture or a wisp of cloud, a gnarled old tree or a glance from a stranger, hits us like a bomb, but a good kind of bomb—one that shakes us out of the stupor we too often descend into as we forsake sharing with our own lives the precious gift of our true and careful attention. And so it was, apparently, with rootsy singer-songwriter Jason Isbell and his complete absence from my radar (Just how did that happen?) until late last night when my music aficionado friend Kevin saw fit…