A Genetic Algorithm-based Composer

With the development of economy of our country and the advancement of science and technology, the standard of living has made great progress. Moreover, music has walked into most families gradually, and becomes the important part of our people's lives. However, the intercourse of most non-speciality colony and music merely rests on the level of appreciation, which makes people flinch from music producing. The invention of algorithmic composition provides a new method of producing of music, makes producing of music more multiplication and popular, and provides another probability for the intercourse of people and music. So, algorithmic composition becomes a new field of study.The paper discusses a intelligence composition method based GA(Genetic Algorithm), and makes pertinence studies for several difficulties of composition method based GA such as expression of music knowledge, consequence framework of music inheritance and the problem of style of music.First of all, the paper introduces mode and interval to describe pitch characteristic of music, provides signs of special notes, and makes differentiation among several special notes. Secondly, the paper adopts period as elementary units of inheritance manipulation, which can create music segments of almost whole notion. At last, the paper introduces style characteristic of music, which can produce music segments that users need according to users'feeling factors. Meanwhile, the paper makes correlative studies for adaptability function of GA that can be described by style characteristic of music, and puts forward new thought and method that can assure the producing qualities of music by using system period database and system mode database and making strict rules of crossover and variation of inheritance manipulation.