The melody of Havana by Pentatonix runs 409 notes across 65 bars, 2:29 long in Cm at 116 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? Havana chords and lyrics.