Swap or Select the Audio Track on your Video on YouTube
The audio swapping tool allows you to add music to your video from a library of licensed songs. Many of these songs are from our free Audio Library, and you may use them in videos that you monetize on YouTube. However, some of these songs are ad-supported, indicated by this icon . If you use them, the owner’s ads may appear on your video, and you will not be able to monetize this video.
Adding audio tracks to your video
Go to your Video Manager page, and click the arrow next to Edit on the video you’d like to edit
In the drop-down menu, click the Audio button
Select a track by clicking on it and preview your video with the music track added
Search for a track using the search box, or browse by genre using the Featured Tracks tab
Once you've found a track you like, click the Save button, and the new audio will be applied to your video. Audio tracks can be positioned in a precise part of your video using the position audio feature.