What's the greatest song ever made, in your opinion?

[HoloDust]

haxxiy said:

Very hard to pick a single one.

However, Bach's The Well-Tempered Clavier encompasses so many styles and so much skill it works as a paragon for most of the ideas expressed in modern day music, so I'll go with it.

Mate, don't be THAT guy - I know OP is not specific, and technically yes, all songs are fair play, so quite a bit of classical music would be on top, but I think it's quite obvious what he had in mind.