Once you learned what shell chords are and how to play them, it’s time to play a tune with these. Sunny (Bobby Hebb) is a very popular song that is quite repetitive in its harmony (chord progression) and therefore not that hard to learn. The song can also be played in different styles, you should check out the versions by Pat Martino and Greg Howe. This is by the way one of the criteria to that defines a “good” standard (and one of the reasons why a song becomes a standard), the strong melody and harmony allows for multiple interpretations.
Sunny also emerges regularly at jamsessions, so it’s no luxury to learn to play it (well). Besides that, it’s just a fun tune to play.
Video at the end of the page.