The melody of Who Knew by P!nk runs 277 notes across 60 bars, 3:10 long in A at 140 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? Who Knew chords and lyrics.