The utility model relates to a music device which has the structure that identification code is embedded into a non volatile memory cell which is integrally arranged in a music device with an allocated sequence number. The music device comprises one receiving part which comprises one operating device, one applying part connected to the operating device, and one writing part which comprises one CPU, wherein the receiving unit is used for receiving inputted serial numbers by a user of the music device. The applying part is used for specific arithmetic for the received serial numbers for forming the identification code which is associated with the serial numbers, and the applying part can specifically identify the music device. The applying part is used for writing the generated identification code and integrally arrangement in the specific address of the non volatile memory cell in the music device; thereby, the written in identification code is not improperly rewritten.