Add music and soundtracks in iMovie on iPad
You can add any of the following types of background music to a movie project:
Soundtracks and theme music: iMovie comes with a collection of soundtracks that dynamically adjust to fit the length of your project. Soundtracks include the music from iMovie themes, which you can add separately from themes. Theme music works just like a soundtrack and is automatically adjusted to fit your project. For more information about themes, see Work with themes in iMovie on iPad.
Music: You can add songs from the Music app that have been synced to your device using Music on your computer.
Note: To use a song you purchased from the iTunes Store in your project, you must be the copyright holder of the song or have express permission from the copyright holder. For more information, see the iMovie for iOS and iPadOS software license agreement.
Imported: You can add songs that you created in GarageBand, Logic Pro, or another app and imported into iMovie using iCloud Drive or the Music app on your computer. (To import background music from iCloud Drive, see “Add background music or other audio from iCloud Drive,” below.)
Background music clips are colored green in the timeline. If you add a song that’s less than 1 minute long, it behaves the same as a sound effect in the project and is colored blue in the timeline. See Add sound effects in iMovie on iPad.
Note: Songs that appear dimmed or are marked Unavailable need to be downloaded to your device for use in iMovie. Use the Music app or iTunes to download songs from iCloud, or use the Finder or iTunes on your computer to sync songs from your music library. If a song on your device still appears unavailable, it may be of a type that can’t be used in iMovie. For example, songs protected by digital rights management can’t be used in iMovie.