Wow, that is really cool to hear that someone else heard what sounds like the same thing I experienced. Very cool. Do you remember how any of the melodies sounded? Enough to maybe whistle when you're out and about in the mountains? Last year after I heard this, I tried whistling the melody of the last song I remembered hearing. I hoped I could communicate with it and elicit a response, but I haven't heard it since. If you have anymore experiences with it, or anything similar, be sure to let us know.