This collection of doo-wop ditties only appears squeaky clean; it’s the tiny imperfections and flashes of personality that make each song a standout. The Chordettes synchronize their vocals with spine-tingling precision, while the Cheers are wonderfully sloppy and almost boozy. The Monotones improvise a playful, bouncy rhythm around a thwacking kickball; the Dells transcend the goofiness of the genre by going straight for the heart.