I Keep Forgettin’ by Leiber & Stoller is in Bbm at 110 beats per minute and runs 1:26 across 22 bars. It uses 6 chords — N.C., Fm, C7, Ab, Ab7, Db7. 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? I Keep Forgettin’ guitar melody tab.