def related_artists
      return @related_artists unless @related_artists.nil? || RSpotify.raw_response
      response = RSpotify.get("artists/#{@id}/related-artists")

      return response if RSpotify.raw_response
      @related_artists = response['artists'].map { |a| Artist.new a }
    end
def related_artists
      return @related_artists unless @related_artists.nil? || RSpotify.raw_response
      response = RSpotify.get("artists/#{@id}/related-artists")

      return response if RSpotify.raw_response
      @related_artists = response['artists'].map { |a| Artist.new a }
    end
Returns array of similar artists. Similarity is based on analysis of the Spotify community’s {http://news.spotify.com/se/2010/02/03/related-artists listening history}.

 @return [Array<Artist>]

 @example
           artist.name #=> "Arctic Monkeys"
           related_artists = artist.related_artists

           related_artists.size       #=> 20
           related_artists.first.name #=> "Miles Kane"