With a lean, minor-key track that hints at Dire Straits and spaghetti-Western scores, the sly country-psychedelic explorer Kacey Musgraves sings about being “lonely with a capital H, if you know what I mean” in “Dry Spell.” It’s from “Middle of Nowhere,” an album due May 1 that will feature guests including Willie Nelson, Miranda Lambert and Billy Strings. “Dry Spell” serves up more or less single entendres with complaints about having “nobody’s tool up in my shed” and “nobody’s truck up in my drive.” Musgraves’s voice sounds frustrated and exasperated, but also ever so slightly amused.