This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book describes "Gangnam Style" or music video proper as it is about the musicless version and the many similar new obscure types of music video that saw the light of day after music video moved online. Music Video after MTV engages specifically with post-millennial music video, but it does so without losing touch with the history of music video and the history of music video studies thus far. The book describes "Audiovisual remediation" and focuses on theoretical questions and concerns, particularly media theoretical issues. This brief discussion of audiovisuality leads onto the main concern of, "The musicalization of vision". The chapter describes that music video functions not only as a visualization of music but also as a musicalization of vision.