Who was the first group of people to write down musical scores?

The first group of people known to write down musical scores were the ancient Greeks, particularly with the use of a system called "Greek musical notation." This notation was developed around the 5th century BCE and allowed for the transcription of melodies and musical concepts. Additionally, the use of neumes in medieval Europe during the 9th century marked a significant advancement in notating music, leading to more standardized forms of musical scores that followed.