1. They gather only for services of prayer and plainsong.

2. A plainsong melody serving as the basis of a polyphonic composition by the addition of contrapuntal voices, as in 15th-century polyphony.

3. A slowly changing plainsong pedal note was elaborated by upper voices, which did not follow the main melody note for note as before.

4. A plainsong melody serving as the basis of a polyphonic composition by the addition of contrapuntal voices, as in 5th-century polyphony.

5. Most chanting is unaccompanied, often because no one is available with the required skill, especially to accompany plainsong.

6. The first choral work ever existed was believed to be the Gregorian chant , unison plainsong sung in church services at the time of Pope Gregory I (590-640).