The melody of I Just Called To Say I Loved You by Stevie Wonder runs 168 notes across 52 bars, 2:42 long in Gb at 112 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 Just Called To Say I Loved You chords and lyrics.