Sadler's Wells, LondonIn a magisterial triple bill, Lucinda Childs, Maguy Marin and Anne Teresa de Keersmaeker let us hear, see and feel the composer's classic in exhilarating ways'A confusion of babel … indecipherable uncorrected horror." When critics first heard Beethoven's 1825 Grosse Fuge, many were bewildered by the barbed-wire intensity of its contrapuntal writing, its uncategorisable form. Now it is consider…