Executive Director of The Hong Kong Federation of Youth Groups Dr Rosanna Wong Yick-ming (centre), Director of Leisure and Cultural Services Thomas Chow (right), and Assistant Director of Broadcasting (Radio) Tai Keen-man (left) joined some 9,000 young musicians lead by renowned percussionist Dr Lung Heung-wing to rehearse a percussion piece at the Hong Kong Coliseum today (May 27). The performance is one of the attractions of the "Dragon Jamboree" concert to be staged on June 30, which is expected to set a new Guinness record. The concert, a variety-filled show featuring some ten thousands young musicians, is one of the celebration programmes of the 10th anniversary of the establishment of the HKSAR.