Rename from yt-dlp ugly naming convention to snake_case

snake_case_rename.sh

#!/usr/bin/bash

for file in ./*.mp3
do
    new_file=$(echo "$file" | sed 's/\.\///g' | sed 's/\[[^]]*\]//g' | sed 's/([^)]*)//g' | sed 's/\.[^.]*$//g' | sed 's/[^a-zA-Z :]//g' | awk '{$1=$1;print}' | sed 's/ /_/g' | tr '[:upper:]' '[:lower:]' | sed 's/$/.mp3/g')
    echo "old file name: '$file'"
    echo "new file name: '$new_file'"
    echo ""

    mv "$file" "$new_file"
done