And now we have our answers!!!
Oh, didn't you know?
A lot of you were probably first introduced to the wonder of Buckley when his version of Hallelujah serenaded Marissa Cooper's death on The O.C. (as well as the Season 1 finale montage).
But the musical wizard had plenty more where that came from — including a very special cover of Lilac Wine.
And since Penn is playing Jeff Buckley in the upcoming biopic, he took his "research" and performed the beautiful song LIVE at one of New York's lovely little clubs.
CH-CH-CHECK IT OUUUTTT (ABOVE)!
He and Leighton Meester need to do a duet. And they need to do one now! Riight?
Maybe together, their voices could bring world peace. Ha!