What was the best singer-song writer ever born?!

What was the best singer-song writer ever born?

I personally think was Jeff Buckley! Even I don't know what was the best song of him... 'dream brother, forget her...'

1 week ago
Of the last 15 years of the alternative folk/rock scene.

A question like this cannot be answered. You ask "ever" - that means we have to include those people who are long forgotten from hundreds of years ago. So who knows?