For Windows to get just the music, you need to download
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and
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, put youtube-dl.exe and ffmpeg.exe into the same folder, open a command prompt, go to that folder, and run the following;
youtube-dl.exe --extract-audio --audio-format mp3 -k
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Linux instructions are distro based. Just add the repos to apt, pacman, or yum. Install the packages and the above command should be about the same minus .exe
Good luck!