I like to add background music to enhance the rhythms of nature but the the rhythm of these snow geese speaks for itself and needs no improvement. I was mesmerized by their motion and rhythm as thousands of birds flew in unison. The flight took place in near darkness one morning at Squaw Creek NWR. ISO sensitivity ranged from 8000-16000, yes 16,000! Recorded with a Canon C100 using a 100-400 lens. White balance at 6000k.