Abstract: Four musical excerpts representing four different emotions of ‘happy, joy, sad, and fear’ were selected as stimuli by emotions scale. The electroencephalogram was recorded simultaneously and the alpha power was analyzed with factors of brain region, valence, and intensity of the musical emotions. The results showed that the alpha power was closely related to emotional valence and intensity. The difference between ‘joy and fear’, ‘happy and fear’, and ‘fear and sad’ was statistically significant. In the parieto-occipital region, the alpha power was significantly larger in calm emotion than in intense emotion within negative emotions; meanwhile within intense emotions the alpha power was significantly larger in positive emotion than in negative emotion.