The purpose of this research was to investigate the effects of extracurricular music participation on preschool children’s social skills in Hong Kong. This study was quantitative dominant, whilst qualitative data was collected to triangulate with the quantitative data. Phase one was the intervention and quantitative data collection whilst individual interviews and class observations were conducted in phase two. Interventions were three different extracurricular activities including: 1) group music training; 2) piano lesson; and 3) drawing class. The duration of the interventions was 24 weeks and the instrument used to collect data was the Social Skills Improvement System-Rating Scale (SSIS-RS). Participants were 180 preschool children aged from four to five (n1=72, n2=72, n3=36).Interviewees were teachers and parents from the different intervention groups. Results of ANOVAs revealed that extracurricular activities have positive effects on participants’ social skills. Tukey post hoc tests revealed that the effects of group music training on participants’ social skills was significantly higher than the piano lesson and the drawing class in all seven subscales; effects of piano lesson on participants’ social skills were significantly higher than the drawing class in four subscales. Qualitative data indicated that parents’ understanding of social skills was similar with each other. Parents’ expectations of extracurricular activities were varied between groups, but were similar within each studied group. Teachers’ perception of social skills and their perception of their role and responsibilities were diverse between groups. Teachers’ perception of effects of extracurricular lessons on young children’s social skills was diverse too. Qualitative data showed that parent’ expectations on the extra-curricular activities, teachers’ beliefs and instructional strategy might influence the results.This study indicated that music education can play a role in young children’s development