It's rare that a video trending on YouTube actually fits the mission of this blog. But here you have one. As the producer of this video writes, this is a "musical tribute to two great men of science. Carl Sagan and his cosmologist companion Stephen Hawking present: A Glorious Dawn - Cosmos remixed. Almost all samples and footage are taken from Carl Sagan's Cosmos and Stephen Hawking's Universe series." You can download the track here. And, meanwhile, I've added this clip to our YouTube Favorites.