I honestly think that this is the best thing I've heard this year. Let's just say it's the seductively ethereal tones of Sufjan's voice and we need not add anything else.
Ironically, the first time I heard it was some months ago. Didn't give it much credit. Second time around though, I was like WOW. Wow! Wow.
Sisyphus is the latest project of that awesome dude Sufjan Stevens, who delivers a lot of random stuff via his music (he seems quite a tripped out oddball at times) but when he doesn't deliver the weird shit he creates masterpieces. He is, quite simply put, a genius. And like all geniuses, difficult to label & categorize.