A sample script of grooveshark gem.

grshark.rb

# -*- coding: utf-8 -*-

require 'grooveshark'

client = Grooveshark::Client.new

songs = client.search_songs('素晴らしい世界 FLOWER FLOWER')

songs.each do |s|
  puts "#{s.name} - #{s.artist}"
end

song = songs[0]
songurl = client.get_song_url(song)

system("mplayer -slave -really-quiet #{songurl}")