This article explores potential uses for MP3 players in secondary classrooms. It presents an overview of current applications and describes an exploratory study of classroom uses. Seven high school teachers and one teacher educator participated in a three-month project to examine MP3 technology as applied to high school instruction. Their ideas and recommendations illustrated congruence with the existing knowledge base and help to clarify site-based support requirements, implications for school media centers, and emerging applications to high school curricula. (Contains 2 tables.)