code: public static WxOutMsg respMusic(String to,
                                       String title,
                                       String description,
                                       String musicURL,
                                       String hQMusicUrl,
                                       String thumbMediaId) {
          WxOutMsg out = new WxOutMsg("music");
          out.setMusic(new WxMusic(title, description, musicURL, hQMusicUrl, thumbMediaId));
          if (to != null)
              out.setToUserName(to);
          return out;
      }
docs: 创建一个音乐响应