youtube-dl
https://www.tecmint.com/download-mp3-song-from-youtube-videos/
Single Song
youtube-dl -x --embed-thumbnail --audio-format mp3
Start at a point in the playlist, troubleshoot unavailable videos
youtube-dl -x --embed-thumbnail --audio-format mp3 --playlist-start 5
youtube-dl mp3
https://askubuntu.com/questions/178481/how-to-download-an-mp3-track-from-a-youtube-video
youtube-dl --extract-audio --audio-format mp3 <video URL>