The synthesis method is as follows: 1. Use speech synthesis software: There are some speech synthesis software that can convert the sound into music. You can search online and try these software, which requires recording some sample sounds and generating music based on these sounds.

2. Use music production software: If you have experience in music production, you can use music production software to synthesize AI songs. You can record your own voice and import it into music production software, and use the synthesis tools and effects in the software to make music.

3. Cooperate with a music producer: If you have no experience in music production and want to use your own voice to synthesize AI songs, you can consider cooperating with a music producer. You can record your own voice and send it to a music producer, who can use professional music production tools and techniques to produce music.