Cannot delete music from iMovie Music Library
I recently created a sample project. I dragged a few songs from my iTunes library into the iMovie sound library. I wanted to delete a couple of songs. I right clicked, clicked on "reveal in finder," deleted the song. This was per instructions found here https://discussions.apple.com/thread/251652599. No luck, as the title to the song is still listed in the library. Dragging the song to the trash can does nothing, as does highlighting the song and hitting the delete key.
I want to completely remove these songs. I do not want them showing up in the library at all.
I'm using a Macbook Pro, M1X.
MacBook Pro 16″, macOS 12.0