Adding music to imovie

Not sure what you mean. As I said, you cannot add Apple Music songs to iMovie. They are DRM protected. I believe that with Catalina or newer you can access iTunes through the Music item in the iMovie media project sidebar. Or you can drag the songs from your iTunes library, and those should work in iMovie if purchased after Year 2009.

-- Rich

That's correct. Apple Music is a subscription service and all of the songs there are DRM protected and cannot be used in iMovie.

You can use in iMovie all songs purchased in iTunes after year 2009, as those are not DRM protected. Also, you can use all songs available from any other source as long as they are not copyright protected or DRM protected.

-- Rich

Why does IMovie let you add Apple Music songs to iMovie then? Seems like a terrible design to let you add them