👉 In music, a "undermelody" is an extended melodic line within a song or piece of music that is not part of the melody itself. It often appears as a solo note or a simple chord progression at the end of a section, and it can be played without any additional accompaniment. Undermelodies are commonly used in instrumental settings to add a sense of complexity or to create a sense of dissonance with other musical elements. They can also serve as an important part