Receiving fanmail from Thom Yorke and Devendra Banhart, Radiohead finally handpicked her to tour with them last year, but Natasha Khan would have probably felt more comfortable at some Renaissance fair, playing only for unicorns. With Autoharp odes to crystal knights and songs that claim to channel her alternate personality, “Pearl”, the British singer-songwriter might be indie rock’s only authentic mystic. Somehow, the music melts away the potential for hokeyness: Pounding on pianos, cranking out delicate little click-clack beats and shivering through choruses with an ultraromantic soprano, Khan proves she’s a powerhouse under her billowy sleeves. She could be the next Kate Bush — or, at the very least, she could be Björk’s new spirit animal.