The melody of When You Say Nothing At All by Alison Krauss & Union Station runs 238 notes across 25 bars, 2:31 long in Ab at 100 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? When You Say Nothing At All chords and lyrics.