When You're Smiling by Louis Armstrong is in Eb at 120 beats per minute and runs 3:08 across 48 bars. It uses 21 chords — Bb, F7, Dm, Edim, Am, Dbaug, F, G7, 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? When You're Smiling guitar melody tab.