Hong Kong will host a world music composition competition with a difference next year - all entries, written for a chamber ensemble, must feature Western and Chinese instruments. Co-presented by the Hong Kong Chinese Orchestra and Luxembourg Sinfonietta, the International Composition Prize 2013 is inviting composers from around the world to compose a piece that will "bridge the east-west and traditional-modern musical divide". The deadline for submissions is September 15. All entrants are required to compose a work of 10 to 12 minutes that use seven Chinese and seven Western instruments to depict nine pictures in a designated sequence, says Marcel Wengler, founder of the decade-old annual competition. He says this requirement will pose a real challenge to the contestants. "We had 105 applications in 2008 when we designated sheng , or the Chinese mouth-organ, as the required solo instrument in new compositions for the orchestra. But I would expect fewer entries this year given the difficulty in mastering not one but seven Chinese instruments," said Wengler, who is also the sinfonietta's artistic director. Yan Huichang, artistic director of the Chinese Orchestra, says the Chinese instruments were selected on the basis of their distinctive character. The instruments are the sheng , dizi (bamboo flute), erhu (two-string fiddle), guzheng (zither), pipa (lute), sanxian (three-string fretless lute) and a set of Chinese percussion. To help the contest, Yan visited Paris, Brussels and Luxembourg in March to give lectures on Chinese music. Joshua Chan, chairman of the Hong Kong Composers' Guild and a juror for next year's International Composition Prize, says the upcoming contest "signifies the international recognition of Chinese music". The other jurors on the panel include top mainland composer Guo Wenjing, who will adjudicate works by the four finalists in Hong Kong on January 13.