👉 An opus is a type of musical piece that consists of several sections, each with its own melody and arrangement. These sections are often used to create a cohesive whole or as individual pieces within an orchestral composition. In music theory, an opus is also known as a "major scale," which refers to the fundamental mode of the scale. The major scales in Western music include C major, D major, E major, F major, and G major. Each major scale has its own unique