You will get the following message "Matched third party content."
If you click on it, you will see more details such as:
"Your video may include the following copyrighted content:
Acknowledged claims
Musical Composition administered by:
UMPG Publishing
What does this mean?
Your video is still available worldwide. In some cases ads may appear next to your video. Please note that the video's status can change, if the policies chosen by the content owners change. Learn more about copyright on YouTube.
This claim does not affect your account status."
If your video is blocked, you will see a list of the countries blocked.
YouTube will also prompt you to AudioSwap, meaning to swap the audio in your video with one of their free songs in their catalog.