Alpine horns?

I think that these musicians are playing alpine horns, but please correct me if I am wrong.   The music produced was very jazzy.   Listening to them play under a full moon, after a lovely meal rounded our evening off perfectly.  

My extra is of the moon shining down on to the show ground.  It is now officially winter here but it will still get to around 30 degrees C dropping down to 23 degrees at night.