Music theory is the study of how music works, the notation, language, patterns, structures. There are key things to know in “music theory”. “rudiments” are key things that are needed to understand music notation (key signatures, time signatures, and rhythmic notation).
Music theory is frequently concerned with describing how musicians and composers make music, including tuning systems and composition methods among other topics. Because of the ever-expanding conception of what constitutes music.
Music theory as a practical discipline encompasses the methods and concepts that composers and other musicians use in creating music. The deep and long roots of music theory are visible in instruments, oral traditions, and current music-making. Many cultures have also considered music theory in more formal ways such as written treatises and music notation. Practical and scholarly traditions overlap, as many practical treatises about music place themselves within a tradition of other treatises, which are cited regularly just as scholarly writing cites earlier research.