<![CDATA[Limited use of interactive learning media in elementary schools had contributed to low student engagement and unsatisfactory music learning outcomes, particularly in learning about musical instruments diversity. Therefore, technology-based learning media appropriate to students’ characteristics were required. This study aims to develop and evaluate the feasibility and effectiveness of a musical instruments diversity application to improve students of Grade IV music learning outcomes. This research employed a Research and Development (R&D) method adapted from the Borg and Gall model. The research subjects were Grade IV students at Protomulyo 1 Elementary School, Kendal Regency. Data were collected through interviews, observations, documentation, questionnaires, and tests, then analyzed using descriptive analysis, normality testing, N-gain score, and paired sample t-test. The results showed that the application was very feasible, with media expert validation of 96.8% and material expert validation of 95.3%. The paired sample t-test showed a significant value (2-tailed) of 0.000, and the N-gain score was 0.815, indicating high effectiveness. The study concluded that the developed application was feasible and effective in improving Grade IV students’ music learning outcomes, offering a practical model for integrating technology into elementary music education.]]>
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