Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/user/killgruz/videos" "https://www.youtube.com/channel/UCpGCuiAOFIDurA-hU_p2E0w/videos" "https://www.youtube.com/user/gamesdonequick/videos" "https://www.youtube.com/channel/UCXlS4EkyvX51u5I7fcSeebw/videos" "https://www.youtube.com/channel/UCtUbO6rBht0daVIOGML3c8w" "https://www.youtube.com/c/karljobst")
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
