YouTube-DL will do it.
Steps
1. Download the Windows exe from the link above and drag it to your desktop.
2. Press Windows Key + R and type cmd when the box comes up.
3. A black command prompt window should come up, type "cd Desktop" (no quotes)
4. In the same window, type "youtube-dl.exe [REPLACE WITH LINK OF VIDEO] -f bestaudio' (no quotes). You should have the sound from the video on your Desktop (in the highest quality YouTube offers). Close the black window and you should be good to go.
Hope this helps!
Also: If you're doing something like making a small patch and having the best possible quality isn't important, I recommend
dirpy.com. It's super easy to use and you can download a specific section as an mp3 very quickly.
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