Cat Nelson One warm February evening in Shenzhen, Bryn Terfel stands centre stage and launches into "Son lo Spirito Che Nega" from Arrigo Boito's 1868 operaMefistofele, his voice filling the hall with theatrical force. Then, just as quickly, he undercuts the drama. "My three border collies go crazy when I sing this in Wales," he tells the audience at Shenzhen Longgang International Art Centre, laughing.