A server apparatus connected in a communication network provides a plurality of music piece template data files respectively representing features of source music pieces. A client apparatus connected in the communication network requests a music piece template data file from the server. The server delivers and the client receives the requested template data file. The client creates a new piece of music based on the received template data file. The created music piece is a new piece but resembles the source music piece to a certain extent having certain characteristic features of the source music. In an alternative arrangement, the server delivers a source music piece, and the template data file is created at the client side by extracting features from the source music piece.