Watch What Happens by Michel LeGrand is in Ab at 120 beats per minute and runs 2:35 across 35 bars. It uses 21 chords — Cmaj7, Cm7, Cb69, Bb7, Ebmaj7, Eb6, F9, Fm7, 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? Watch What Happens guitar melody tab.