It’s a bit of cheating, as it has nine parts, but Shine On You Crazy Diamond. Perfect instrumental, perfect lyrics, perfect everything.

As a perhaps distant second place, To nie Ptak. The instrumental is at the same time melancholic, sultry, and dreamy, and Kayah, well, she’s an amazing singer. I love how this song builds a metaphor through its denial (“she isn’t a bird of paradise”, implying “she’s a woman”), only to contradict it near the end (when darkness steals your heart, you’ll see that she’s a black-feathered raven).