I movie and I tunes help

Hello kristie124,

I understand you're having trouble getting music added to your iMovie project on your Mac. I'd like to help you out with this.

Based off of the device details on your post, you're running macOS 10.15 Catalina. Since iTunes is not available for that macOS version, your steps will be slightly different. Make sure you're following the correct steps listed in Add music, sound effects, and voiceover in iMovie, specifically this section:

"Add music and sound effects using the iMovie browser on Mac

You can browse and add content from your music library and built-in sound effects from within iMovie. 

1.With your project open, click Audio at the top of the window, then choose an option:

• • To access your music library, click Music (or iTunes if you’re using macOS Mojave or earlier) in the Libraries list, then browse selections.*
  • To access built-in sound effects like footsteps or rain, click Sound Effects in the Libraries list.

2.To preview a song or sound effect before you add it to the timeline, click the play button next to each song or sound effect. You can also

select a song or sound effect, click in the waveform at the top of the media browser, then press the Spacebar to preview.

3.When you’ve found the song or sound effect you like, drag it from the media browser to the timeline:

• • For background or theme music for your movie, drag songs to the music well.
  • To attach music or sound effects to a specific video clip, drag it under the video clip so a bar connecting the clips appears.

If you want to use a song you’ve created in GarageBand and access it from the iMovie browser, share your GarageBand project to the media browser in GarageBand."

Respond back if you need continued support with this issue.

Thanks for using Apple Support Communities.

Take care.