This is a composition (usually musical in nature)which stinks to high heaven. Odor is how Americans might spell that but Brits like the Odour spelling. Somehow, due to a typographical error, the d and s (two side by side keys) got confused enough times, that the S gained in prominence. Then, like the Great Vowel Shift, dour changed to dure and here we are today. Stinky music.