The melody of Waiting on the World to Change by John Mayer runs 340 notes across 41 bars, 2:36 long in D at 80 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? Waiting on the World to Change chords and lyrics.