British singers Sam McElroy (R) and Teresa Banham (L) perform on stage during a dress rehearsal of one of the leading contemporary British composor's opera, Sir Harrison Birtwistle's "The Story of Io", in Bregenz on this picture taken July 24. The opera is directed by Stephen Langridge from the UK and had it's premiere late evening July 25 during the annual Bregenz festival. REUTERS/Miro Kuzmanovic REUTERS PR/