The melody of I Knew I Loved You by Savage Garden runs 322 notes across 39 bars, 3:25 long in A at 82 beats per minute. The tab sits low on the neck, mostly under the fourth fret, 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? I Knew I Loved You chords and lyrics.