convert to mp3 code example
Example 1: youtube mp4 downloader
I suggest videovor.com, it's really great and you even get an option to choose
if you want the whole video or just the audio!
Example 2: youtube to mp4
ytmp3.cc is the best by far
Example 3: yt to mp3
Youtube-DL works great. Download from https://youtube-dl.org/. To use, type youtube-dl <url> --audio-format mp3