Pretty sure this hasn't been posted (or the search button failed me).
It's just a neat video, it sets science to music (pretty much what it sounds like). I personally like it, it can really make you think. It's about our place in the universe, and space exploration possibilities.
It's not for everyone, it's not technical science, it's presented so pretty much anyone can understand it - but many won't be interested. I would recommend watching the second video first. It's my least favourite, but it clears up some parts of the first one.
It gets boring after a while, since they auto-tune and pitch shift every single voice in the songs, but I have to admit that Bill Nye's auto-tuned voice in "We Are All Connected" with visuals of galaxies was pretty trippy.