Person Name: Anon. Composer of "[O sing unto the Lord a new song: let the congregation of saints praise Him]" in The Sunday-School Hymnal and Service Book (Ed. A) In some hymnals, the editors noted that a hymn's author is unknown to them, and so this artificial "person" entry is used to reflect that fact. Obviously, the hymns attributed to "Author Unknown" "Unknown" or "Anonymous" could have been written by many people over a span of many centuries.
Anonymous