gistfile1.rb

class Echonest::Api
  def analysis(filename)
    analysis_url = analysis_url(filename)
    Analysis.new_from_url(analysis_url)
  end

  def analysis_url(filename)
    loop = true
    analysis_url = nil

    while loop
      response = profile(filename)

      case response.track.status
      when 'unknown'
        upload(filename)
      when 'pending'
        sleep 60
      when 'complete'
        loop = false
        analysis_url = response.track.audio_summary.analysis_url
      when 'error'
        raise Error.new(response.track.status)
      when 'unavailable'
        analyze(filename)
      end

      sleep 5
    end

    analysis_url
  end
end

# new
require 'echonest'

filename = 'xxx.mp3'
echonest = Echonest('XXXXXX')

analysis = echonest.analysis(filename)
beats = analysis.beats

traditional_interface.rb

class Echonest
  module TraditionalInterface
    def get_beats(filename)
      # ...
      analysis(filename).beats
    end
  end
  class Api
    include TraditionalInterface
  end
end

# traditional
require 'echonest'
require 'echonest/traditional_interface'

filename = 'xxx.mp3'
echonest = Echonest('XXXXXX')

beats = echonest.get_beats(filename)