Fittingly enough, for purveyors of all things gloriously offbeat and infectious, “Beachy Head” is a nugget of haunted pop classicism, complete with careening choruses, swoonsome harmonies and a deliciously nasty sting in its tail. As its repeated refrain of “I’m gonna miss you/ When you’re gone” attests, this isn’t exactly an ode to the seaside, but instead something rather darker, menacing even – the cloud in the clear blue sky, or the worm in the Pastels’ juicy pop apple.