Beside the point of this thread but -- are we the only ones who thought that the use of this song (putting aside the question of personal taste) gave the impression that the film maker considered the old songs inferior? That new and modern was better after all? The song has no contempory connection with the other songs used. It's very, very new. It comes at the end so that it's the song that is seen (heard) to sum up the whole story.

Also I'm with Arkie -- the lilac thorn is not an image from tradition. Everyone has always known which trees have thorns. If the singer has developed a thorny lilac why weren't we told? Should be a market among Gothic gardeners for a lilac with poisoned thorns. A black lilac with a bad smell. Now there's an idea.
Cheers, Joy