Vocabulary is an important part of learning English, especially for young learners who are still developing their basic language skills. Using interesting and effective learning media can help students improve their vocabulary. Therefore, this study aimed to investigate the effect of Nursery Rhymes Music Videos on the English vocabulary mastery of fifth-grade students at MIS Hi Achmad Syukur. This study used a quantitative method with a pre-experimental one-group pre-test and post-test design. The sample consisted of 25 fifth-grade students. Data were collected through vocabulary tests given before and after the treatment and were analyzed using the Wilcoxon Signed-Rank Test was carried out with the assistance of SPSS. The results showed that students’ vocabulary mastery improved after using Nursery Rhymes Music Videos, as shown by the higher post-test scores. The Wilcoxon Signed-Rank Test showed a significance value (2-tailed) of 0.000, which was lower than 0.05. Therefore, the alternative hypothesis was accepted and the null hypothesis was rejected. This result showed that there was a significant difference in students’ vocabulary mastery before and after the treatment. It can be concluded that Nursery Rhymes Music Videos were effective in improving the English vocabulary mastery of fifth-grade students and can be used as an alternative medium for teaching vocabulary to young learners.
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