The amusing thing is that I knew I'd heard the phrase "A Mighty Wind" before. The only literary reference I could find with the phrase however was such:
And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, and she is shaken of a mighty wind.
--Revelations 6:13
Go fig. The reunion of Folk Musicians can only be described in terms of the Apocalypse.