example of using class exec

file.rb

# When including Sounds, some other modules/constants are loaded as well
module Sounds
  def self.included(base)
    super
    base.class_exec do
      # these are all defined elsewhere
      include Sounds::Introduction
      include Sounds::Base
      include Sounds::Loader
      include Sounds::Effects
      include Sounds::SpecialCommands
      include Sounds::Arpeggiator
    end
  end
end