Here’s the melody line and words for a simple round to enjoy this Advent/Christmas – PDF Christmas_Halleluia_Melody_2013 Works well in 2 or 4 parts.
I suggest that each part sings the 8 bars 4 times through. The tune does not resolve in the last bar. For me this symbolises that the work of Christmas message never ends.
Use this music freely, with acknowledgement.
Cheers and Happy Christmas