I have always liked Dolly Parton. She always seems down-to-earth and honest in her presentation to the public. I, too, appreciate beauty in simplicity. I think I posted a link to a solo guitar player whose arrangements of pop and jazz tunes I really appreciate:
Lex Von Sumayo. He seems to have a real knack for capturing the feel of the tune he is covering in a very simple manner. Dolly Parton has the very real advantage in that she sings, and can put across her message with her voice, but Lex does the tune's melody credit by keeping it front and center always too.