The melody of A Moment Like This by Leona Lewis runs 398 notes across 65 bars, 3:29 long in Bb 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? A Moment Like This chords and lyrics.