This Old Heart Of Mine by The Isley Brothers is in Bb at 120 beats per minute and runs 1:50 across 36 bars. It uses 8 chords — C7, F, Am, Bb, Gm7, C, Dm7, Gm. 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? This Old Heart Of Mine guitar melody tab.