This article explains why triplet fills in music can often sound unpleasant. It highlights that the rhythmic placement of triplets can disrupt the overall groove and feel of a song. The author emphasizes the importance of maintaining a consistent pulse and suggests that triplet fills can create a sense of imbalance. Additionally, they mention that inexperienced musicians may struggle with executing triplet fills accurately, leading to a lack of musicality. Overall, the article suggests that careful consideration should be made when incorporating triplet fills into music.