A power trio which sways from down-tempo doom to British Heavy Metal, and their drummer’s tape manipulations are the glue that holds it all together? If the tectonic shifts don’t diminish you with a blink, nervous hums will creep up through Crabskull’s eerie non-sequiturs and form pustules on any clean mind — infectious stoner metal in its newest mutation, perversion, persuasion, enticing all to bang head, bang head, bang head.