Named after Douglas Adams’s fictional translating fish, this remarkable quartet has evolved its own musical language. Jazz and classical techniques are interwoven, not to mention a slight touch of folk. Unfamiliar at first, but gently seductive, it keeps you listening through the sheer power of invention, which isn’t surprising when you consider the eminence of those involved: pianist Barry Green, bassist Chris Laurence, percussionist Paul Clarvis and the quietly luminous voice of Brigitte Beraha. Co-composer, with Green, of most of these 16 pieces, Beraha employs both lyrics and a kind of ethereal scat-singing to quite hypnotic effect.