FILE - In this Monday, Oct. 10, 1988 file photo, rock star Freddie Mercury, center left, lead singer of the pop group Queen, arrives with opera star Montserrat Caballe at the Royal Albert Hall in London to publicize their hit song 'Barcelona.' Spanish opera diva Montserrat Caballe, renowned for her bel canto technique and her interpretations of the roles of Rossini, Bellini and Donizetti, has died. She was 85. Hospital Sant Pau press officer Abraham del Moral confirmed her passing away early on Saturday Oct. 6, 2018. (AP Photo/Martin Cleaver, File)