“We are the blessing and the curse,” head Sadie Dallas Good sings on “The Very Beginning,” but most of this band’s 16(!)-album output has been a blessing. The Sadies have, with less fanfare than they deserve, been one of the most surefire alt-country acts for nearly 20 years, collaborating with Neko Case, Jon Langford and Andre Williams. Recorded over the course of a year and sounding more worked over than previous albums, Internal Sounds is full of endings and beginnings, with cinematic instrumental act breaks, twangy fist- pumpers (“The First 5 Minutes”), muscular power pop (“Another Tomorrow Again”) and haunting drones (the excellent closer, “We Are Circling”). What can’t they do?