Father Calvin Goodwin, Fraternity of Saint Peter (FSSP; http://www.fssp.org/ ), explains the Extraordinary Form of the Holy Sacrifice of the Mass. To view more videos about the Extraordinary Form (called also by the various names "Gregorian Rite mass," "Latin mass," "Tridentine mass," etc.), buy the FSSP's DVD "The Extraordinary Form of the Roman Rite: An Instructional Video for Priests and Seminarians" here: http://www.fsspdvd.com/.