A method and system for synthesizing electronic watermarks is disclosed. The method includes generating electronic watermark sounds for music data by converting harmonic overtones that match the music data into signals. The generated electronic watermark sounds are then synthesized into the music data. The synthesized electronic watermark sounds and the music data are then output via various ways. In one embodiment, an encoded music file is generated, which can be sent to a recipient via a network or recorded on any of various recording media for distribution.