12-Bar Blues in Ruby

12_bar_blues.rb

module Play
  def self.note note = nil
    @note = note.to_s.upcase
    self
  end

  def self.for bars = 1, length = 1
    bars.times do 
      puts @note
      sleep length
    end
  end
end

class Integer
  def bar note
    Play.note(note).for(self)
  end
  alias :bars :bar
end

# Just in E for now
12.times do
  4.bars :e
  2.bars :a
  2.bars :e
  1.bar  :b
  1.bar  :a
  1.bar  :e
  1.bar  :b
end

puts 'Goodnight!'