A couple of years ago I posted about this lovely song by Peter Grant.
Peter has sent some real music to get a proper idea how it sounds in practice.
SATB with accompaniment:[audio:http://www.sixmaddens.org/wp-content/uploads/2017/11/A-Christmas-Lullaby.mp3|titles=A Christmas Lullaby]
A backing track:[audio:http://www.sixmaddens.org/wp-content/uploads/2017/11/A-Christmas-Lullaby-Backing-Track.mp3|titles=A Christmas Lullaby Backing Track]
… at St Finbarr’s, Glenbrook:[audio:http://www.sixmaddens.org/wp-content/uploads/2017/11/A-Christmas-Lullaby-at-St-Finbarrs-Glenbrook.mp3|titles=St Finbarrs]
Once you realise that this is just the song you need for Christmas in your parish you can purchase the sheet music at As One Voice.