There’s actually dozens of projects on GitHub providing this kind of stuff, I even did a script to download music from YouTube given an specific ID, I use this as an alias, when I want to download something I type ytmp3-download [VIDEO IDs...] in the terminal, it requires yt-dlp package:

ytmp3-download() {
    # Check if at least one video ID is provided
    if [ $# -eq 0 ]; then
        echo "Usage: ytmp3-download VIDEO_ID [VIDEO_ID...]"
        echo "Example: ytmp3-download abc123 def456 ghi789"
        return 1
    fi

    # Check if yt-dlp is installed
    if ! command -v yt-dlp &> /dev/null; then
        echo "Error: yt-dlp is not installed. Install it first:"
        echo "sudo apt install yt-dlp"
        return 1
    fi

    # Build URLs from video IDs
    local urls=()
    for id in "$@"; do
        urls+=("https://youtube.com/watch?v=%24id")
    done

    # Download all videos as MP3
    yt-dlp -x --audio-format mp3 -f "ba" --embed-metadata --embed-thumbnail --extractor-args "youtube:player-client=default,-tv_simply" -o "%(title)s.%(ext)s" "${urls[@]}"
}

But if your playlists are in another place like Spotify etc… there’s also tools for that.

I want to improve this downloading the original metadata given a music title and insert into the .mp3 file, it’s currently pulling from yt.