Dan Halamandres and Elyza Nicholas, hailing from Southend-on-Sea in England, together form the duo Caleb, and their music partakes of the melancholy of seaside regions, as do their videos. Or, as in “Little Boat Song,” it’s quite a darkness that sweeps in. Their voices are haunting in all their songs, including “Glory’s End,” which they’ve placed on their Soundcloud page.