SATB a cappella - although could also be done with light accompaniment. Gary has given us a new piece with a great Renaissance flavor reminiscent of Hassler's setting. Short enough for an introit that could be sung anytime of year, but could also be done as an anthem. The traditional Psalm (96) for Christmas Day.
Sing unto the Lord a new song.
Sing unto the Lord all the earth.
Bless his name, show forth his salvation from day to day.