Here's a relatively new site offering a frequently requested feature, namely the ability to let you download a YouTube video as an audio MP3 track that you can listen to offline.
You'll find the site, Green MP3, at https://greenmp3.com/ and there's really not much to add. Just head to YouTube, find the video you want, copy its address, then paste it into the Green MP3 box. Within a few seconds you'll see a download link to your converted file.
From my own tests, it seems to work just fine. And there's no software to install, as the conversion is all done online.
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