This event took place back in the mid-'90s on the edge of Salisbury Plain in Wilshire, UK. This area is rife with UFO sightings and other unexplainable incidents, and there are many lay lines that pass through the area and Stonehenge is located nearby.
I was a soldier back then and our battery was to use one of the ranges (I can't recall which one) in this area for the weekend, and on Friday night about 12 Landrovers were packed up full of sleeping gunners. We weren't on a tactical footing. We had no camouflaged and defensive positions set up, but a single guard had to be maintained through the night.
My shift was the 0200-0300 one and it was a clear, cold February night. The full moon had that fantastic ring around it that it gets on nights like this. Excellent visibility. What disturbed me were the sounds I was hearing.
What I can best describe as pan pipes playing a slow, mournful tune, something akin to whale song, no fixed melody or structure. It seemed to be in the breeze, it was relatively calm with little wind but what there was seemed to carry this music.
I walked the line of vehicles and nobody had a radio on; everyone was zipped up in their bags asleep, and rightly so. It really was cold. The music continued all the way through my shift and I was glad when the time came for me to wake the next guy for his turn. I jumped in the back of my wagon, zipped my bag over my head and hid!
The next day I spoke to the guy I woke to do his guard duty and asked if he'd heard anything. He hadn't. I explained what I heard and he just shrugged it off saying somebody must have been having a party somewhere. This seemed very unlikely as we were a long way from any houses and it was very early in the morning for music to be still on.
It also didn't sound like music anyone would be playing at a party unless some Tibeten Monks were on an all nighter nearby! I wonder if any other soldiers have had any similar experiences on the training area. I never liked the plain because the nights were a little nervy sometimes, but that night really stuck in my memory.