Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/channel/UCMFcMhePnH4onVHt2-ItPZw" "https://www.youtube.com/channel/UC0yPCUmdMZIGtnxSnx5_ifA" "https://www.youtube.com/channel/UCh2YBKhYIy-_LtfCIn2Jycg" "https://www.youtube.com/channel/UCq-8pBMM3I40QlrhM9ExXJQ" "https://www.youtube.com/channel/UCU0FhLr6fr7U9GOn6OiQHpQ/videos" "https://www.youtube.com/channel/UCOuIgj0CYCXCvjWywjDbauw/videos" "https://www.youtube.com/user/geoffreyspot/videos" "https://www.youtube.com/channel/UCOhW7sWI8IeAi0ZYe-P3qRg/videos" "https://www.youtube.com/channel/UC8v0zDOvrG5g5xdf9ovUj0g/videos" "https://www.youtube.com/channel/UCtHwXunWT8PQ5HoYrXqn8cQ/videos" "https://www.youtube.com/channel/UC_56vSO35nctESDan8agevg/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
