Here some usefull scripts:

Downloading stuff from youtube

You need youtube-dl and id3lib

#!/bin/bash

YOUTUBE_USER=" ... "
URL="https://www.youtube.com/user/${YOUTUBE_USER}/videos?view=0"
ARTIST=" ... "
ALBUM="Youtube Videos"

youtube-dl -o "%(title)s.%(ext)s" -ikx --audio-format=mp3 ${URL}

id3tag --album=${ALBUM} --artist=${ARTIST} *.mp3

Set a Playlist as URL and go in an empty directory. It will download all the videos, create an mp3 version and tag every mp3 in the folder.