In this case study, the author research on the current teaching phenomena of Paper 3: Creating of the Hong Kong Diploma of Secondary Education (HKDSE) Examination Elective Subjects: Music. The examination has been implemented after the curriculum reform of the senior secondary school since 2012 where music composition becomes one of the compulsory assessment. According to the Curriculum and Assessment Guide (Secondary 4-6) Music by the Curriculum Development Council and the Hong Kong Examinations and Assessment Authority, the assessment objective is to create and arrange music using appropriate compositional devices, and explain the use of music elements in compositional devices of their compositions. Without any prior experiences in the teaching composing for public examination in the past, schools have adopted different models to teach composition which include hiring external company and tutor to teach; forming a joint-school network; and teaching the whole curriculum by the school teacher. This qualitative study contributes to the understanding of the current HKDSE learning and teaching situation with a focus on the perspectives from school music teachers and composer-instructors. Copyright © 2021 Melbourne Graduate School of Education, University of Melbourne, Australia.