Kacey Musgraves knows how to wrap an intriguing story around an ear-snagging hook while capturing the rhythms of small-town life. Songs like “Silver Lining” and “Step Off” are notable for their delicate balance of hope and realism; “Stupid” and “It Is What It Is” face up to the hard truths behind romance with remarkable clarity. This is smart, superbly crafted, and truthful to its tuneful core.