There was a significant plainsong revival in the 19th century, when much work was done to restore the correct notation and performance-style of the old plainsong collections, notably by the monks of Solesmes Abbey, in northern France. After the Second Vatican Council and the introduction of the vernacular Mass, use of plainsong in the Catholic Church declined and was mostly confined to the monastic orders. and to ecclesiastical societies celebrating the traditional Latin Mass (also called "Tridentine Mass"). But, since Pope Benedict XVI's "motu proprio", "Summorum Pontificum", use of the Tridentine rite has increased; this, along with other papal comments on the use of appropriate liturgical music, is promoting a new plainsong revival.