ABSTRACT: The purpose of this quantitative research was to determine whether Mozart's "Sonata for Two Pianos in D Major K.448" (hereafter referred to as "Sonata K.448") had a significant impact on student math achievement scores by comparing the results of the total population of 24 control students who had no music being played in the background and the total population of 38 students who had music played in the background. The findings of the study showed that listening to Mozart was not related to math lab performance, standardized test score performance, or the amount of daily misconduct. In addition, the 6 math lab outcome measures were not related to gains in standardized test score performance. The small sample size of 62 could have led to problems with design, resulting in no effect results.