Don’t Know Why I Love You by Stevie Wonder is in D at 80 beats per minute and runs 1:51 across 15 bars. It uses 5 chords — D, C, Bb, F, G. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? Don’t Know Why I Love You guitar melody tab.