Interval is a basic concept of the basic music theory. In recent years, the definition, classification and nature of some concepts in the music theory books are worth discussing.
音程，是音乐基础理论中的一个基本概念，近年来一些乐理书中对其中若干概念的称谓、定义、种类、性质等的解释有值得商榷之处。
Musical theory is the basic course of learning music.
乐理就是音乐理论，是学习音乐的基础课程。
Sightsinging teaching, as the basic theory of music, its importance has been embodied increasingly.
作为音乐基础理论的视唱教学，越来越体现出它的重要性。
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