Jann Klose, who covers Tim Buckley/Larry Beckett's SONG TO THE SIREN on his album, MOSAIC (People Records), also sings Tim's "Song For Janie," "Pleasant Street" and "Once I Was" in the movie.
The song that leads into the end credits, "Lilac Wine" was sung by Penn Badgley but originally by Nina Simone. Without the rights to Jeff Buckley's music, they had to get creative and used a song that Jeff had famously covered.