This article reports on two experiments of exposure to music and cognitive performance. In Experiment 1, Canadian undergraduates performed better on an IQ subtest (Symbol Search) after listening to an up-tempo piece of music composed by Mozart in comparison to a slow piece by Albinoni. The effect was evident, however, only when the two pieces also induced reliable differences in arousal and mood. In Experiment 2, Japanese 5-year-olds drew for longer periods of time after singing or hearing familiar children's songs than after hearing Mozart or Albinoni, and their drawings were judged by adults to be more creative, energetic, and technically proficient. These results indicate that (1) exposure to different types of music can enhance performance on a variety of cognitive tests, (2) these effects are mediated by changes in emotional state, and (3) the effects generalize across cultures and age groups. (Contains 4 figures and 1 table.)