And users who upload the converted YouTube mp3 to a website might not receive direct punishment from YouTube, but their content might get deleted. Such punishment has happened some years ago when YouTube threatened to take a popular video converter site to court to stop people from converting videos to MP3. This violates YouTube's Terms of Service, and both YouTube and Google will take harsh measures to stop this. Technically, putting a song from YouTube on a USB is not illegal unless the content is copyrighted and you want to download and upload it to your website without the permission of the content creator. It is easy to download videos from YouTube, but how to download music from YouTube to a USB? Is it legal? Is It Illegal to Download Music from YouTube to a USB? Also, if you like a song, you can also save it to a USB to listen to it on any computer or portable player. When you watch a highly-rated movie or show, you can download that video to your computer for offline watching. YouTube is a good place for both movie lovers and music fans to watch the latest movies or listen to the latest tracks.