The Merry Old Land Of Oz by Harold Arlen is in Ab at 112 beats per minute and runs 1:41 across 46 bars. It uses 22 chords — Eb, Cm, Fm, Bb, Ab, Adim, Dm7, Db6, 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? The Merry Old Land Of Oz guitar melody tab.