Use this to download this category as MP3 with youtube-dl:
declare -a list=("https://www.youtube.com/channel/UC2eYFnH61tmytImy1mTYvhA/search?query=vim" "https://www.youtube.com/user/Computerphile/videos" "https://www.youtube.com/user/L4DL4D2EUROPE/videos" "https://www.youtube.com/channel/UCNk3CeLpCA0qIZsuzGl09cwa" "https://www.youtube.com/user/seowhistleblower/videos" "https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/videos" "https://www.youtube.com/channel/UCNNfzr9A5dEOscVEDyyzo-A/videos" "https://www.youtube.com/channel/UC-yuWVUplUJZvieEligKBkA/videos" "https://www.youtube.com/user/ZetaTwo/videos" "https://www.youtube.com/user/AkBKukU/videos" "https://www.youtube.com/channel/UCgTNupxATBfWmfehv21ym-g/videos" "https://www.youtube.com/channel/UC3S8vxwRfqLBdIhgRlDRVzw" "https://www.youtube.com/channel/UCIPetZTndV_mB3GT6tNQ2Zw/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