I really like the peice by Kati Agocs “Terry Riley”, which has been made popular by Juilliard harpists — Heidi Van Hoesen Gorton, and I believe it was originally written for Bridget Kibby? I heard it this past summer in Tacoma, and it was very effective.
“Up next was a modern take on an old theme: Kati Agocs’ “John Riley,” the first movement from ‘Every Lover Is A Warrior.’ Agocs is a modern classical composer and fellow Juilliard grad, who has taken the traditional Appalachian folk ballad “John Riley” and adapted it for harp. Ms. Van Hoesen Gorton allowed the listeners to appreciate the bluegrass feel of “John Riley” while yet maintaining its classically lyrical line.”
From a review — here