#!/bin/sh

notify() {
    notify-send -r 9991 "$@"
}

i=0
while IFS= read -r line; do
    case "$i" in
    0) track_artist="$line" ;;
    1) track_title="$line" ;;
    *) break ;;
    esac
    i=$((i + 1))
done <<EOF
$(MPC_FORMAT="%artist%\n%title%" mpc)
EOF

notify "$track_title" "by $track_artist"