Add artwork to songs by using the thumbnail from the first video on youtube

artwork.sh

#!/usr/bin/env bash

ROOT_DIR='/directory/with/artist/album/song'  # root directory which will be traversed
ALBUM='Unknown Album'                         # only set artwork for songs in given album (for each artist)

pushd "$(pwd)"
cd "$ROOT_DIR"
for artist in *; do
	cd "$artist"
	if [ -d "$ALBUM" ]; then
		echo "$artist"
		cd "$ALBUM"
		for song in *; do
			echo -ne "\t${song%.*}... "
			url=$(youtube-dl --get-thumbnail "ytsearch1: $artist - ${song%.*}")
			curl "$url" 2>/dev/null | ffmpeg -y -i "$song" -i - -map 0:0 -map 1:0 -c copy tmp_song.mp3 &>/dev/null && mv tmp_song.mp3 "$song"
			echo "Done!"
		done
		cd ..
	fi
	cd ..
done
popd