Chung, Soo-Hwa The purpose of this study was to investigate the following tasks; Background music which affects emotion condition is more effective to any pattern of task performance. In order to achieve the purpose of this study, two kinds of research tasks was set up as follows. First, does the background music of sedativity and familarity make any effect of task performance according to task types (nonverbal task and verbal task)? Secondly, does the background music of sedativity and familarity make any effect of task performance according to task levels (simple task and complex task)? The following research hypotheses were made to concretely achieve their research tasks. Hypothesis Ⅰ. The experimental group which heard the background music of sedativity and familiarity will be more effective than comparative group in nonverbal task performance than that of verbal task. Hypothesis Ⅱ. The experimental group which heard the background music of sedativity and familiarity will be more effective than comparative group in simple task performance than that of complex task. To achieve the purpose of this research, the process was established as follows. The testees for the effect of background music on task performance were 101 students of C girls\' high school in Cheonan. Verbal and nonverbal task performance was executed by 5 subordinate tests (perception speed, picture parade, space perception, language inference, word power) of diagnostic intelligence test. Simple and complex task performance was used Wood-Q called \'Kapra\' and also sedativity and familiarity background music was chosen and used by appropriate songs in a hymnbook. Through above process the results of this study are as follows. First, experimental group showed higher score than comparative group in the test of perception speed, picture parade for nonverbal task performance. Statistically this was significant difference (p< .05, p< .05) each other. But there was no significant difference between experimental group and comparative group in the test of space perception. And also there was no significant difference between experimental group and comparative group in verbal task performance. Secondly, experimental group showed higher average score than comparative group in the repetitive simple handmade activity for simple task performance. Statistically this was significant difference (p< .05). On the contrary, there was no significant difference between experimental group and comparative group in the complex task performance demanded high concentration and tension and also in the activity of building complex spiral tower.