장음계, or the "Jang-eum scale," is a traditional Korean musical scale that consists of five notes. This scale is commonly used in various forms of Korean music, including folk songs and classical compositions. The notes in the 장음계 create a unique sound that is distinct from Western musical scales, often evoking a sense of nostalgia and cultural identity. The 장음계 is part of a broader system of Korean music theory, which includes other scales and modes. It is closely related to the concept of 음계 (musical scales) and is often used in conjunction with traditional instruments like the 가야금 (gayageum) and 해금 (haegeum). This scale plays a significant role in preserving and promoting Korean musical heritage.