<![CDATA[This project generated a physics e-book integrating Lampung classical guitar heritage into the Grade 11 sound-wave topic. Such development corresponds with the Merdeka Curriculum emphasis on contextual instruction while responding to the limited availability of culturally embedded learning resources across West Tulang Bawang Regency. An R&D pathway employing the ADDIE framework guided the project. Information gathering relied on Harwell and Gatti’s four-level scale, while interpretation utilized ideal mean (Mi) together with ideal standard deviation (SBi) calculations. Assessment contributors consisted of two expert validator, six physics teachers, and 36 Grade 11 students from SMAN 2 Tumijajar. Content specialists awarded an average validation value of 94.85, categorized as valid, whereas media specialists produced a score of 66.00, classified as valid. Practicality appraisal involving three physics teachers generated a practical category with an average total of 34.17, while student readability attained 114.08, falling within the good category and satisfying the criterion X̅i < X ≤ X̅i + 1.5 SBi. These outcomes confirm that the e-book satisfies validity and usability requirements for classroom application, with the Lampung classical guitar functioning as a connector between physics principles and students’ cultural experiences.]]>
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