Esoteric Sound Stream is an application for the Android tablet/smartphone designed to work with Esoteric Network Audio Players. The basics of its operation include selecting musical tracks using the Android tablet/smartphone, creating customized personal playlists, and playing the selections or playlists. All screens for key operation, playlists, library, etc. are arranged for easy viewing, enabling even users unfamiliar with the app to operate it intuitively and trouble-free. Its high degree of refinement even meets the rigorous demands of advanced and experienced users. Key to this achievement is the app’s excellent search and retrieval performance, which takes full advantage of tag information. Since images are also cached in the app, album artwork can be instantly scrolled through and libraries can be freely sorted into such classifications as artist, year of recording, composer or category. This use of tag information even allows musical numbers of the same name which differ in format to be easily identified on the screen.