From today's New York Times:
A coming album paying tribute to the British singer-songwriter Nick Drake will include a song performed by the actor Heath Ledger, Billboard reported. The track, a cover of Mr. Drake’s “Black Eyed Dog,” was recorded by Mr. Ledger in 2007 for an art installation; Mr. Ledger died the following January from an accidental drug overdose. Mr. Drake, the gentle-voiced folk-rock singer of “Pink Moon” and “Things Behind the Sun,” struggled commercially but became a critical and cult hit after his death from an overdose of antidepressants at age 26 in 1974. Other performers on the tribute album, which was announced at the MidemNet music industry conference in France, include Eddie Vedder, Dave Grohl, Norah Jones and Jack Johnson.
If truth be told, the weird thing in this item, for me anyway, is the idea of Dave Grohl singing a Drake song. Doesn't seem his style. In any case, the idea of Ledger crooning isn't any more unlikely than Pierce Brosnan singing ABBA.