The melody of Without You by David Guetta featuring Usher runs 220 notes across 56 bars, 2:32 long in D at 125 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? Without You chords and lyrics.