Нашёл 30 млн ответов for 'YouTube mp3 converter'.
https://ytmp3.cc/
https://www.y2mate.com/en30/youtube-mp3
https://www.y2mate.com/en30/convert-youtube
https://youtubetomp3music.com/
https://www.easymp3converter.com/
https://320ytmp3.com/
https://mp3-youtube.download/
https://www.go-mp3.com/
https://youtubemp3.eu/
https://y2mate.guru/en3/youtube-to-mp3/