How to add music to a YouTube video
You can add music to a YouTube video that you’ve already uploaded, using the YouTube audio sharing feature. This feature allows you to add licensed music to your YouTube video, which means you will not have to worry about violating copyright laws.
Visit YouTube.com and click “Sign in” in the upper right corner of the page. Log in with your YouTube account using your username and password.
Click on your username in the upper right corner of the screen. Then click on “My videos” in the drop-down menu. This will show you the list of your YouTube videos.
Find the YouTube video where you want to add the music and click on the arrow to the right of the “Properties” link. In the drop-down menu, click “Change audio.”
Look through the list and choose the licensed music you want to add to YouTube video. You can enter a keyword, browse by genre or by artist to get the song. Click on the song you want to add to the video.
Click on “Publish.” This adds the music to your YouTube video.