This article extends research linking shopping behavior to environmental factors through changes in emotional states. With time fixed or variable during a simulated shopping experiment, shoppers were exposed to music varying by degree of familiarity. Afterward, subjects reported their perceptions of shopping duration, their emotional states, and their merchandise evaluations. Analyses revealed that individuals reported themselves as shopping longer when exposed to familiar music but actually shopped longer when exposed to unfamiliar music. Shorter actual shopping times in the familiar music condition were related to increased arousal. Longer perceived shopping times in the familiar music condition appear related to unmeasured cognitive factors. Although emotional states affected product evaluations, these effects were not directly related to the music manipulations.