Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/channel/UCoIYRzAMbUl67JXAQtWe2yg/videos" "https://www.youtube.com/channel/UCH_oxl_3wwmV26GgS0YjzxQ/videos" "https://www.youtube.com/channel/UCrbtHmrSZf_WTB86ZxT29uw/videos" "https://www.youtube.com/channel/UC9b-291fyS-KCmz4ti9LcNA/videos" "https://www.youtube.com/user/MondialTissusfrance/videos" "https://www.youtube.com/channel/UCoBS3vfU7lR18bTZQdvVQXA/videos")
for val in ${list[@]}; do
name=$(basename "$val")
if [ -e $name ]
then
continue
fi
mkdir $name
cd $name
youtube-dl -f mp3-128 $val
cd ..
done
