You can obsess, Cary-Grantesquely, about a stray intercostal clavicle, or you can be content with half a dinosaur—in this case, half the band of that name. Expect harmonic depth, rhythmic pep, sly humor, and the thrill of watching these two young Brits—he on piano, she on cornet—party like it’s the late Cretaceous. —E.E.