def browse(letter, options={})
     api_response = @api_client.make_api_request(:GET, "artist/browse", {:letter => letter}, options)
     @api_client.artist_digestor.list_from_xml_doc(api_response.item_xml("artists"))
    end
def browse(letter, options={})
     api_response = @api_client.make_api_request(:GET, "artist/browse", {:letter => letter}, options)
     @api_client.artist_digestor.list_from_xml_doc(api_response.item_xml("artists"))
    end
calls *artist/browse* API method and returns Artist array

 @param [String] letter the letter(s) returned artist names should artists
 @param [Hash] options optional hash of additional API parameters, e.g. page_size => 50, etc
 @return [Array<Artist>]