declare -a list=("https://www.youtube.com/c/MustardChannel/videos" "https://www.youtube.com/c/StardustLaChaine/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