Ratings & Reviews performance provides an overview of what users think of your app. Here are the key metrics to help you identify how your app is rated by users and how successful is your review management strategy.
2.5西方音乐简史共分19个部分，分别涉及古代、中世纪、文艺复兴时期、巴罗克时期、古典主义、浪漫主义和现代主义音乐，每一部分均有小结、可自测的习题，还配有各个时期代表作品的音频或视频。
