The melody of River by Leon Bridges runs 292 notes across 44 bars, 3:30 long in Db at 64 beats per minute. The tab sits almost entirely in the first two frets, 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? River chords and lyrics.