1) The monastery resounded with the ancient plain-song during morning prayers.

2) Plain-song was the predominant form of music in churches during the medieval period.

3) The haunting beauty of plain-song filled the cathedral with a sense of peace.

4) The nuns chanted plain-song in unison, creating a solemn atmosphere in the chapel.

5) The monks' voices blended harmoniously as they performed the plain-song hymn.

6) Listening to the plain-song chant, the congregation felt a deep connection to the divine.

7) The simplicity of plain-song melodies resonated with the worshipers gathered in the cathedral.

8) The plain-song tradition has been preserved and passed down through generations of singers.

9) The professor gave a lecture on the history and significance of plain-song in religious music.

10) The choir practiced singing plain-song to prepare for the upcoming church service.