From: Brian Candler <b.candler@...>
Date: 2010-03-04T01:39:18+09:00
Subject: Re: Music Theory (#229)

Oops, the each_with_index was a left-over artefact. It should say:

  def scale(pairs, degrees = [1,3,5,7])
    degrees.collect do |d|
      pair = pairs[(d-1) % pairs.size]
      offset(pair[0], pair[1])
    end
  end
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