O brother where art thou

A good Stanley Brothers comp would be one place. On the other hand if what she likes is the sound of that soundtrack, with its modern production and all, then the Alison Krauss comp Now That I've Found You might be more suited.

Worth a read:

http://www.indyweek.com/indyweek/fifteen-years-later-bluegrass-is-still-reeling-from-o-brother-where-art-thou/Content?oid=5070656

I do love this:

But even though the soundtrack focuses on traditional tunes, the Coens and company were surprised to find that some songs they had thought were in the public domain—and thus, free to use in the film—were not, in fact, traditional. They'd been mining discs of music that had often been incorrectly deemed traditional. Wilbur knew that sloppy attributions wouldn't fly.

"I remember my first conversation with Ethan when he showed me the CD, and he said, 'Look, it says right here, 'Traditional,'" Wilbur says. "I said, 'So what?'"