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Why some videos include song information in the description
The description of a video that contains music may include information about the song(s) in the video. YouTube adds this information automatically to some videos when the video has been identified and claimed by music rights holders via YouTube’s rights management tools, including Content ID. These notes usually link to a music video or other official content for each song, to help you discover songs and artists that you haven’t heard before.
Learn more: https://support.google.com/youtube/answer/7680188
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