I've been singing this all evening while wrapping presents. With decreasing restraint with every slurp of wine! As 'Christmas music' goes, it has one of the best alto lines ever written, in m.h.o.
This is the best version I could find on YouTube from a very limited selection. It's not ideal - there's a rogue oboe in there somewhere - and ghastly to watch, owing to the number of people arriving late and bobbing around in front of the camera - so best close your eyes (or wrap presents) while listening.
Special greetings to shepherds and farmers everywhere - especially any I know!