The melody of I Need You by Alicia Keys runs 368 notes across 60 bars, 4:29 long in G at 92 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? I Need You chords and lyrics.