The musical setting of the Ordinary of the Mass was the principal large-scale form of the Renaissance. The earliest complete settings date from the 14th century, with the most famous example being the Messe de Nostre Dame of Guillaume de Machaut. Individual mass movements, and especially pairs of movements (such as Gloria-Credo pairs, or Sanctus-Agnus pairs), were commonly composed during the 14th and early 15th centuries. Complete masses by a single composer were the norm by the middle of the 15th century, and the form of the mass, with the possibilities for large-scale structure inherent in its multiple movement format, was the main focus of composers within the area of sacred music; it was not to be eclipsed until the motet and related forms became more popular in the first decades of the 16th century.