Windows Central reviews best Windows 10 “YouTube to MP3 Converters” which must be in accordance with proper digital copyright legal requirements

https://www.windowscentral.com/best-youtube-mp3-converters-windows

YouTube has an almost infinite library of music, podcasts, and audio to listen to. Sometimes, you want to grab an audio source and place it into a video or listen to it offline. To do so, you’ll need a YouTube to MP3 converter. These allow you to download audio from a YouTube video so you can use it elsewhere. As a quick note, make sure that you have permission to use any of the audio you download.