Director of Leisure and Cultural Services Thomas Chow (front) showed support to some 9,000 young musicians gather at the Hong Kong Coliseum today (May 27) for the rehearsal of the "Dragon Jamboree" concert to be staged on June 30 to celebrate the 10th anniversary of the establishment of the HKSAR. They will perform a percussion piece with hundreds of youngsters from the Mainland, Taiwan and Macau which is expected to set a new Guinness record. Also present at the activity were Executive Director of The Hong Kong Federation of Youth Groups Dr Rosanna Wong Yick-ming (left), and Assistant Director of Broadcasting (Radio) Tai Keen-man (3rd from right)