Emily Wells’ fourth studio album plows through almost as many musical genres as it does musical instruments. Beautiful Sleepyhead and the Laughing Yaks treads confidently through folk, baroque pop, world, rock, Americana, and jazz. Wells also utilizes a plethora of instruments here, though right from the opening “Mt. Washington,” her breathy and bewitching voice proves to be the most salient one. Where she inflects like Feist in “Mt. Washington,” her haunting trill in “50 Year Love Affair” is more similar to Marissa Nadler’s spectral inflections. “Fountain of Youth” boasts doubled vocals that hover above the notes of a distant pump-organ as a brushed snare-drum keeps time, but it’s the string arrangements in this one that stand out, sounding weird and fantastical as if they were arranged by George Martin in the late ‘60s at Abbey Road. Of course no wistful siren song would be complete without a playful glockenspiel, which shows up at the end of the tune. “Dr. Hubris and His Vile of Turpentine” makes good on a banjo to bestow a gorgeous pop song enveloped in bluegrass trimmings.