"Milo", by Quilt.
You already know how we feel about Quilt's second album, "Held in Splendor".
They had a song called "Milo" on their first, self-titled album, which they seem to have decided was the one that they would turn upside down and shake the bejeezus out of, to see what would fall out.
It exists as a 26-minute freak-out on a two-song release self-explanatorily entitled "Quilt in Marfa".
Courtesy of Aquarium Drunkard, you can watch a more concise performance of the song. Hang on to your Canadian Mountie hat. It's a doozy. (The song. And the hat.)