Plainchant, also known as Gregorian chant, is a form of medieval music characterized by its unaccompanied vocal style. It features a single melodic line sung in Latin, often used in religious settings, particularly within the Roman Catholic Church. The melodies are typically modal, meaning they are based on scales that differ from the modern major and minor systems. This musical tradition dates back to the early centuries of Christianity and was standardized under the guidance of Pope Gregory I in the 6th century. Plainchant serves as a means of enhancing liturgical texts, allowing for a meditative and spiritual atmosphere during worship. Its influence can still be seen in various forms of music today.