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In human-robot interaction, emotion expression of robot is one of the important issue for interacting with human more dynamically. In this paper, we consider two issues in view of real robot implementation. One is emotional intensity expression and the other is synchronized expression with behavior of robot. To express emotional intensity, we regulate tempo, pitch, and volume of base emotion sound which are controllable parameters by computer system of robot. We also suggest musical structure which has repeatable section to synchronize with robot's behavior.