Ruby on Rails creating constant on model

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Follow me to create a constant on model. Many people ask where a good place to take a constant. I recommend to you to take a constant on your model.

For instance:
1. I have song.rb

class Song < ActiveRecord::Base
  #--
  # constants
  #++
  KEY_SIMBOLS = [ "C", "C#", "D", "D#", "E", "F", "F#", "G",
     "G#", "A", "A#", "B" ]

  #--
  # public class methods
  #++

 def initial_key
   initial_key_sym = KEY_SIMBOLS
 end

end

2. I have constant KEY_SIMBOLS

3. You can access with:

song = Song.first

song.initial_key

Thanks