How to Convert YouTube to MP3 in High Quality - EaseUS
YouTube Playlist Downloader – free for all users
GitHub - AddonDeveloper/youtube-to-mp3-userscript: The 320 kbps YouTube mp3 userscript generates a 320 kbps - MP3 DOWNLOAD button on YouTube.com. Convert YouTube to mp3 and download the file to your device.
6 Best Free YouTube to MP3 320kbps Converter Online (2021)
拡張機能「 Youtube Downloader」 - Opera アドオン
4K YouTube to MP3 | Free YouTube to MP3 Converter | 4K Download
YouTube mp3 Downloader – Get this Extension for 🦊 Firefox (en-US)