Tunes in G You Should Know. Key of G–DGD Tuning. DGD is a great tuning for playing traditional songs. It lends itself to Melody-Drone playing and is fun. The tunes we will use will be fiddle tunes, waltzes, and maybe a ballad or two. We will also discuss playing in the key of G, using a capo, and the advantages of each approach. If you’ve never played in this tuning, we’ll talk about the process of re-tuning from DAD and answer questions that you might have.