Automated Composition Algorithm for Gentle Music Based on Pitch Melody Unit
基于音高旋律元的柔和乐曲的自动作曲算法

In this paper, an automated music composition algorithm for gentle music is proposed based on pitch melody unit (PMU) which is the minimal operation unit. Firstly, several algorithmic rule models are constructed according to the melody characteristic of gentle music. Secondly, the 1st-order and 2nd-order PMUs are defined, and a model is further constructed to automatically generate pitch melody unit transition tables (PMUTTs) which are the expression of link probability of two adjacent PMUs. Then, the basic data for melody computing are obtained. Thirdly, four operators of melody computing are defined to generate a new PMU, phrase, sentence, and music, respectively. Finally, the gentle music can be produced automatically. Experimental results demonstrate that this PMU-based approach can make the obtained melody more logical and aesthetic than the Markov model approach which is based on operating notes.