Research on teaching evolution model of piano accompaniment in colleges and universities in information age

Piano accompaniment in music teaching is not only a music-performing art but also has its unique value as a teaching tool. The research adopts the LDA model for theme modeling, combines the theoretical foundation of the LDA model, uses Python for practice, constructs the theme discovery and evolution analysis model based on LDA and designs the evolution analysis process of piano accompaniment teaching theme to carry out the evolution analysis of piano accompaniment teaching theme. In this paper, the post-discrete analysis method is used to identify the hot teaching themes in piano accompaniment teaching research. By analyzing the trend of theme evolution in different time slices, it is found that the overall piano accompaniment teaching theme shows more obvious dynamics, in which the theme of “improvisation accompaniment” has been maintained at a higher probability, and the average theme intensity of the piano accompaniment teaching text is maintained at a rate of change between 70% and 90%. Finally, the theme texts were divided into four time periods, and four themes with evolutionary relationships were identified by calculating the JS distance and setting a threshold. Then, the changes in theme keywords in different periods were analyzed to explore the evolution of themes in piano accompaniment teaching.