“Fill the Sea” is the new single from Psalmships, and it is featured on Joshua Britton’s forthcoming EP Keep Your Words. A twisting riff leads into a quaking backend as treacherous, sonic seas are entered. The weight of the instrumentation is sliced through by the guiding, ghostly vocals. Psalmships will be taking the stage at PhilaMOCA on Saturday, May 18, on a billing that also includes The Bones of J.R. Jones and Dan The Movie.