A new form of mass emerged, called the cantus firmus mass. Here, each successive section of the ordinary had the same melody. These cantus firmi were usually written in the plainsong style, but sometimes secular music was used. Most of the time, these masses were based on cantus firmus.
MASS (formally, "MASS: A Theatre Piece for Singers, Players, and Dancers") is a musical piece composed by Leonard Bernstein. Specifically commissioned by First Lady of the United States Jacqueline Kennedy, wife of President John F. Kennedy, it made its premiere on September 8, 1971, conducted by Maurice Peress, as part of the opening of the John F.