The hyenas mainly operate the highly marketed “cacio, yamaha” piano worldwide; the well-produced german “schimmel schummel” piano in europe; the german national treasure “bransler” and the series of brands “heisler”, “omelle,” “seller”; the 100-year austrian brand “helen austria vendron” piano; the full-earth “belz” piano and the manual artistic piano designed by the profession for the performers, the royal grameen piano; the excellent japanese brand “cacio”, “yamaha”; the national brand “helen”, “imamson” and other digital electronic instruments; and the large and small musical parts of the jiangsu “fonling” guangzhou “yu”, “ago”, and “king” and “weiber” rivers in shanghai; and the “damte” drums in tianjin, as well as of various types of brands, such as the “sing ...