Tampubolon J, Tamba EF. The Effect of Accompaniment Music on the Concentration and Learning Outcomes of Grade VIII Students in Alpha Omega Education Tutoring Center. JCAR [Internet]. 2022 Aug. 30 [cited 2026 Apr. 29];1(2):16-22. Available from: https://journal.eltaorganization.org/index.php/jcar/article/view/92