Found via an article about Vimeo on Slate.
powerlinerflyers from wes johnson on Vimeo.
I've stopped and watched similar displays (with fewer birds and wires, though) and there's something fascinating going on. I don't want to know the science behind it; I'd rather apply an imaginative reason.
Watching this with the music the video creator chose (per Slate: "Johnson sets the video to Yann Tiersen's "L'autre Valse d'Amélie," from the Amelie soundtrack, laid down with startling synchronicity to the images. ") - does it make you think these are living musical notes moving and changing, creating the tune as we watch? Or maybe it reminds you of the holes on some huge organic roll of player sky-piano music?