For a song that threatens to start a revolution with boots to the ground, Claire London‘s “Hit the Switch” is suspiciously pristine — a chilly tower of sound sculpted out of the digital ether using buzz-burred electro-stomps and a small army of gracefully deployed synths. But if its sterile sonic aesthetic is at odds with those lyrics, “Switch” still has its share of old-fashioned fire, chiefly thanks to London’s voice, which clambers from intimate purr to throaty howl and back again. This kind of tension is an old trick, but it’s still delicious — like drinking a hot adult beverage in a cozy spot while staring out at a rainstorm.