Although I have these set for the ukulele, the same chords might be applicable to other stringed instruments as well. Crimmond is the world famous tune associated with the metric version of Psalm 23 and therefore will go nicely with any Psalm on the common metre. The D7 note can be difficult enough to play. I say: Forget about the purists and use your thumb for the top string and it should be easy enough. Click on the image for an enlargement.