Sundari, R. and Ardipal, A. 2024. Instrument Model Development Evaluation Authentic Learning Esemble Music In Dumai 15 Public Middle. LANGGAM: International Journal of Social Science Education, Art and Culture. 3, 2 (Jun. 2024), 8-13. DOI:https://doi.org/10.24036/langgam.v3i2.155.