Display title, artist and station via the default notification tool when pianobar starts playing a new song.

pianobar-notify-send.sh

#!/bin/bash

# Modify the following line for your system and add it to your pianobar config
# (usually ~/.config/pianobar/config):
# event_command = /home/johndoe/bin/pianobar-event.sh

[ "$1" = "songstart" ] || exit 0

while read line
do
    for name in title artist stationName songStationName
    do
        value=$(echo $line | grep -oP '(?<=^'$name'=).+' 2>/dev/null)
        [ -n "$value" ] && declare $name="$value"
    done
done

station="$songStationName"
[ -z "$station" ] && station="$stationName"

notify-send "▶ $title" "  by $artist\n  on $station"