<![CDATA[This research aims to develop integrated Science-Mathematics learning materials based on the local wisdom of Sasak culture, especially Gendang Beleq, and to examine their effectiveness in improving students’ understanding of cylinder geometry concepts and Sasak music composition creativity among eighth-grade students of SMPN 3 Kuripan, West Lombok. The research employed a Research and Development (R&D) approach using the ADDIE development model (Analysis, Design, Development, Implementation, Evaluation). The final products include sound-based science learning content (focused on frequency, amplitude, and resonance), contextual visual representations of cylinder geometry found in the shape of Gendang Beleq, two Student Worksheets (LKPD), and a deep Learning-based Lesson Plan (RPP) integrating cultural observation and collaborative music creation activitie. Feasibility validation involved three validators: material expert (88%), media expert (91%), and classroom teacher (85%), with a mean feasibility score of 88% (highly feasible). The sample consisted of 62 student selected through cluster random sampling. Learning effectiveness analysis used Wilcoxon signed-rank and N-Gain. The result indicate a significant improvement in geometry understanding, with pretest 58.4 increasing to posttest 76.3, and music creativity improving 24.5 points (58.0 → 82.5, high category). These findings confirm that Gendang Beleq-based cultural integration contextualizes abstract STEM concepts, enhances affective engagement, and fosters mathematical reasoning and musical reativity holistically at the junior secondary level.]]>
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