We all love brother IZ's medley - "Somewhere Over the Rainbow/It's a Wonderful World". It's a tough song to master and is best played as a solo with a bit of the Reggae or Calypso beat.
I keep getting requests... so for you brave souls here's some home work.
Here's the strum sheet -- see Calypso. Get the strum down then practice the chord progression just below it... 2 measures of 4 beats of each ---- C -- Em, F -- C, F -- E7, Am -- F .
Here's the song sheet... sorry not as nice as you usually get.
Here's the video, so you can play along and sing with Izrael Kamakawiwo'ole.