NATHAN SHERMAN viola | ALEX PETCU percussion   KATE MOORE Crucible (world premiere) IAN WILSON Totemic BENEDICT SCHLEPPER-CONNOLLY One Thing I Know LUCIANO BERIO Naturale   This programme, based around Luciano Berio’s Naturale, is a world of hypnotic sounds, street vendor songs, yearning melodies, and joyous dances.  Berio’s work uses Sicilian folk music as its…