"The Music of Middle-earth" is an unofficial companion app that provides an interactive listening experience to Howard Shore's music for the "Lord of the Rings" films. This app serves as an index for the more than 80 leitmotifs or themes that are present in the film score. It allows users to explore and highlight theme occurrences throughout the soundtrack in a simple and user-friendly way.

Please note that this app does not include any of the actual music from the films. Users must acquire the albums separately. However, if you own the albums, you can listen to the tracks and all indexed sections directly from the application in an interactive manner. The app also displays the currently playing themes while listening to the tracks, enhancing the overall listening experience.

In addition to the comprehensive list of themes and tracks, the app offers the option to browse theme occurrences by theme or by track. This allows users to easily navigate and explore the rich musical landscape of Middle-earth.