Hong Kong pop singer Eason Chan has become the first Chinese performer to play London's O2 arena, with his sold-out DUO Concert, AP reported. Some 12,000 fans descended upon the iconic venue in the British capital Monday night to hear Chan perform twenty five songs from his Mandarin and Cantonese repertoire. Chan's DUO World Tour began in September 2010 in Singapore and has continued across Australia, Asia, Canada and the United States. Chan has released 30-plus solo albums and is one of the best-selling Mandarin and Cantonese pop artists.