中文摘要：

算法的作文是今天的一块很流行的研究地。“巴赫的二声音部分发明”是在 this.paper 的研究目标。语法和“发明”的组合规则首先被介绍，然后二个软计算方法，基因算法和背繁殖(BP ) 神经网络技术，被联合到在填写“二声音部分发明”帮助的实验。在这篇论文介绍的系统相当有效、令人满意。

英文摘要：

Algorithmic composition is a very popular research field today. Bach＇s ＂two voice part invention＂ is the research object in this paper. The grammar and compositional rules of ＂invention＂ are introduced first. Then two soft computational methods, genetic algorithms and back propagation （BP） neural network technology, are combined to the experiment on assisting in composing ＂two voice part inventions ＂. The system presented in this paper is quite effective and satisfactory.