the middle. Sequences from the middle period, starting around the 11th century, such as the sequence for the Mass of Easter Day, Victimae paschali laudes, are less likely to have single lines outside of couplets, and their couplets are more likely to rhyme. By the 12th century, later sequences, such as the sequence for Pentecost, Veni Sancte Spiritus, showed increasing regularity of structure, with rhyming couplets throughout. Medieval sequences are usually modal melodies. While primarily syllabic, sequences can occasionally have short neumatic moments, but they almost never contain melismas. The two verses of each couplet are sung to the same musical line, usually ending on a tonally stabilizing pitch, with variety being created by couplets of different lengths and with different musical arches. Although sequences are vocal and monophonic, certain sequence texts suggest possible vocal harmonization in organum or instrumental accompaniment. The composition of sequences became less frequent when Humanist Latin replaced medieval Latin as the preferred literary style in Latin. New sequences continued to be written in Latin; one of the best known later sequences is the Christmas carol Adeste Fideles, known in English as "O Come, All Ye Faithful". Νotes References External links Schaff, Philip, History of the Christian Church (1910) Catholic Encyclopedia, Blessed Notker Balbulus (Stammerer) Hildegard of Bingen and Medieval Music: A Conversation with Benjamin Bagby of Sequentia, Interview (2018) Latin poetry Latin religious words and phrases Medieval poetry Order of Mass Medieval music genres