Lesson preparation is a crucial part of the teaching process, which is directly related to the quality and efficiency of classroom teaching. However, in the actual lesson preparation for music teaching, there are some problems. For example, when teachers see the teaching materials of a music lesson, they don’t know from which aspects to prepare the lesson, what the contents of lesson preparation are, what the order of lesson preparation is, from which aspects they should think about lesson preparation, and where the key and difficult points of lesson preparation are for different types of music courses. Starting from the perspectives of the explicit and implicit non-musical and musical languages contained in music teaching materials, this paper specifically analyzes what the implicit and explicit musical and non-musical languages in the teaching materials include, from which angles teachers should analyze and think about different types of courses, and how teachers can prepare a music lesson well in specific teaching. It is hoped to provide some references for music teachers’ ideas and methods of lesson preparation.