At the top of every score, and the beginning of every stave, repeated on every line, is a symbol that, to seasoned musicians, becomes so familiar as to be invisible. The humble but mighty clef. Clef ...

Haunted ska trombone, feverish chopped-up beats and window-rattling basslines from Bass Clef, aka London dubstep producer Ralph Cumbers, whose second album arrives four years after his debut but is ...