YouTube download and convert to mp3

https://yt-dl.org/update
https://github.com/ytdl-org/youtube-dl/releases
wget -q https://github.com/ytdl-org/youtube-dl/releases/download/2019.04.30/youtube-dl -O /tmp/youtube-dl
sudo cp /tmp/youtube-dl /usr/local/sbin/
sudo chmod a+x /usr/local/sbin/youtube-dl

# download audio (mp3) only
youtube-dl --extract-audio --audio-format mp3 -o "%(title)s.%(ext)s" https://www.youtube.com/watch?v=foo

# download whole channel starting from 3 months
youtube-dl --extract-audio --audio-format mp3 -o "%(upload_date)s_%(title)s.%(ext)s" --dateafter now-3months -v https://www.youtube.com/user/OpenStackFoundation/videos

# update
sudo youtube-dl -U

# output template
https://github.com/ytdl-org/youtube-dl/blob/master/README.md#output-template