TAMPUBOLON, J.; TAMBA, E. F. . The Effect of Accompaniment Music on the Concentration and Learning Outcomes of Grade VIII Students in Alpha Omega Education Tutoring Center. Journal of Classroom Action Research , [S. l.], v. 1, n. 2, p. 16–22, 2022. DOI: 10.52622/jcar.v1i2.92. Disponível em: https://journal.eltaorganization.org/index.php/jcar/article/view/92. Acesso em: 29 apr. 2026.