A simple way to make your pianobar, send you mac OsX notifications. It puts the Cover Art as the app Icon, and clicking on the notification skips that song. All files are placed in ~/.config/pianobar/, you also need to run gem install terminal-notifier, and put a blank file called ctl in the ~/.config/pianobar/ folder

config

user = user@email.com
password = s3cr3t
fifo = ~/.config/pianobar/ctl
event_command = ~/.config/pianobar/notifier.rb

notifier.rb

#!/usr/bin/env ruby

trigger = ARGV.shift
if trigger == 'songstart'
  # Get current song information
  songinfo = {}
  STDIN.each_line { |line| songinfo.store(*line.chomp.split('=', 2)) }

  `terminal-notifier -title "Pianobar: Now Playing" -message "#{songinfo['title']}\nby #{songinfo['artist']}" -appIcon "#{songinfo['coverArt']}" -execute "echo 'n' > ~/.config/pianobar/ctl"`
end