Celestial Instrument is a term used to describe the HARP, a four-letter stringed instrument that has been around for centuries. The HARP is believed to have originated in ancient Egypt and Mesopotamia, and it has been used in many cultures throughout history. It is often associated with heavenly music and is a popular instrument in classical music. The HARP is also used in folk music, jazz, and other genres. Its strings are plucked or strummed to create beautiful melodies.