The Capital S. is a jazz saxophone quartet formed by Hong Kong active saxophonists in 2017. They perform different jazz composition and their own arrangements of jazz standards. They have recorded their debute LP, The Capital S. in 2017 and gave their premiere performance in the same year. They have been invited to perform at FreeSpace Happening at West Kowloon Cultural District and Lost Stars Live House, with guest, Dr. Chemine Ching. Core members are Hin Chuen Siu, Yin Tak Au, Kaho Wong, and Kenny Lin.