A work prepared by two or more authors with the intention that each contribution will merge into one inseparable whole. If one songwriter writes all of the music to a joint work and another songwriter writes all of the lyrics to the joint work, each songwriter will own 50% of both the music and lyrics.

How Does A Music Synthesizer Work?
A music synthesizer makes sounds by using an electrical circuit as an oscillator to create and vary the frequency of sounds in order to produce different pitches.