If You Were The Only Girl In The World by Nat D Ayer is in Ab at 120 beats per minute and runs 3:01 across 68 bars. It uses 20 chords — Fm, Fm7, Eb, C7aug, C7, F7, Bb7, Gm, and a few more. 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? If You Were The Only Girl In The World guitar melody tab.