A snippet to display music info from MPD or Spotify.

musinf.sh

#!/bin/bash
if [ "$(playerctl -p spotify,mpd metadata -f "{{ playerName }}")" == "mpd" ]; then
    dunstify "$(echo -e "$(playerctl -p spotify,mpd metadata -f "Player: {{ playerName }}\n\nTIT: {{ title }}\nALB: {{ album }}\nART: {{ artist }}")")" -I "/tmp/cover.png"
elif [ "$(playerctl -p spotify,mpd metadata -f "{{ playerName }}")" == "spotify" ]; then
    id="$(basename "$(dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.freedesktop.DBus.Properties.Get string:org.mpris.MediaPlayer2.Player string:Metadata | awk -F '"' 'BEGIN {RS=" entry"}; /"mpris:artUrl"/ {a = $4} END {print a}')")"
    url="https://i.scdn.co/image/$id"
    curl "$url" -o "/tmp/cover-spotify.jpg"
    dunstify "$(echo -e "$(playerctl -p spotify,mpd metadata -f "Player: {{ playerName }}\n\nTIT: {{ title }}\nALB: {{ album }}\nART: {{ artist }}")")" -I "/tmp/cover-spotify.jpg"
else
    dunstify "$(echo -e "$(playerctl -p spotify,mpd metadata -f "Player: {{ playerName }}\n\nTIT: {{ title }}\nALB: {{ album }}\nART: {{ artist }}")")"
fi

Example output: