By the 1990s and into the early 21st century, this style of music drew less on its folk roots than on a number of different styles and influences from contemporary society. In many areas of the United States and in regions throughout the English-speaking world, most or all of the music played during Sunday Mass was taken from this late-20th-century body of work. As a result, traditional forms of Catholic music (such as Gregorian chant) had become rare in many churches, and unknown in some. By the year 2000 most Catholic songbooks preferred contemporary Catholic liturgical music, some hymnody, and a very small collection of chant (which had once been the "sine qua non" of Catholic Church Music).