The old Welsh tune, Llwyn Onn, known in the English-speaking world as Ash Grove, is over 200 years old, and has been used with the hymn lyrics "The Master Has Come" and "Let All Things Now Living." Regardless what title you know it by, it is a wonderful and beautiful tune.
This piece was originally written for piano, then expanded for organ, and has now been rewritten in a different key for string orchestra.
The first violin plays sixteenth-note arpeggios nearly throughout, spelled in a couple of spots by the second violins, who have a rhythmic accompaniment most of the way through. The viola has the rhythmic accompaniment most of the time as well, but joins the cellos for a pieces of the melody in a couple of places. The cello has the melody all the way through, usually in unison with the bass.
FANTASIA ON ASH GROVE, for string orchestra by Tom Kirkland, comes in a pdf file of 338K, with a ten-page score, five two-page parts, and a license page, twenty-one pages in all. Performance time should be approximately 3:40.