Musical pastiche can be dangerous. When you go beyond having influences to embodying those influences, artists can easily slip into self-parody. You need spectacularly good songs to pull it off. The Lemon Twigs, a US duo who have often been dangerously close to mere cosplay – perpetually caught in a time vortex where they get sent back to 1967 every time they reach 1976 – have managed it with historic aplomb on their fourth album.