The melody of My All by Mariah Carey runs 332 notes across 37 bars, 2:32 long in Cm at 120 beats per minute. The tab sits moving up the neck in places, 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? My All chords and lyrics.