Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/channel/UC7ai9kpMWvElaeLiCHWvCWA/videos" "https://www.youtube.com/channel/UClPMGsxje6Q4ZKd_Wq00xlA/videos" "https://www.youtube.com/user/conduiteonline/videos" "https://www.youtube.com/c/LepermisdeFab/videos" "https://www.youtube.com/channel/UCKpQ5WQo9LdwvRYjcYzp2ng/videos" "https://www.youtube.com/channel/UC4oQDzdAL1IUHFu1U_iuCnQ/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
