Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/channel/UC_J1ss7EHjh4T5YStWNvTJw" "https://www.youtube.com/channel/UCjkQgODdmhR9I2TatJZtGSQ" "https://www.youtube.com/channel/UCHVxCo7tMNY6OrjVnJct--A" "https://www.youtube.com/channel/UCG1ppydtvSKmp9xwJsQBpDg" "https://www.youtube.com/channel/UCfOfnhKXAiC27c7noX6Ka5Q" "https://www.youtube.com/channel/UCzjd9v6DMprAAvOBB4sxBPA" "https://www.youtube.com/user/TomliVlogs" "https://www.youtube.com/user/Inaculte/videos" "https://www.youtube.com/channel/UCAiy7bY8nTQCWrkSRh6Wu9w")
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
