This question is difficult to answer in a general way because the terms rules of music theory and good are a bit nebulous. My classic example of western music that breaks music theory is the Welcome to the Sacred Harp Publishing Company | The Sacred Harp Publishing Company collection of Southern Hymns. These a capella vocal arrangements were made by people who didn’t know any formal music theory, and as such it is rife with parallel 5ths. You’ll fail undergraduate music theory/composition if your piece has parallel fifths because they have standardized on 16th Century, but in my opini...