Chant notation is a system used to represent the melodies of chants, particularly in Gregorian chant. It helps singers understand how to perform the music by indicating pitch and rhythm. This notation typically uses neumes, which are symbols that show the contour of the melody rather than precise notes. The earliest forms of chant notation date back to the 9th century, evolving over time to include more detailed markings. Chant notation is essential for preserving the traditions of sacred music and allows for accurate performance of historical chants in religious settings.