The melody of Wouldn’t Change A Thing by Demi Lovato & Joe Jonas runs 479 notes across 52 bars, 3:20 long in Bb at 85 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? Wouldn’t Change A Thing chords and lyrics.