SLOW BURN Country firecracker Miranda Lambert keeps the sizzle but embraces her softer side on her latest A decade ago, Miranda Lambert burst onto the country scene, branded as a volatile, gun-totin’ spitfire. But these days the sassy singer-songwriter has mellowed a bit. “All the fiery stuff is what set me apart in the beginning,” Lambert says, “because no one else was doing it. With success, I’ve been able to calm down and acknowledge...