Which advanced chords can I use for a song composition in scale of G?
I am making a song composition in a scale of G. I have already used major chords **G, C and D** and in some places I have used **Am, Em and Bm**. I would like to make this composition richer with some advanced chords? I am not a guitar expert. I know that we can add Gsus, Cadd9, etc but not sure about their exact application. So I wanted to check with you guys to know whether anything else can be added to make my composition better. If someone can provide with some thumb-rule or formula, that would be even better.