Computer programming; computer software design; computer system design; computer software consultancy; rental of computer software; updating of computer software; consultancy in the design and development of computer hardware; information technology consultancy; research and development of new products for others; software as a service (SaaS) services featuring software for digital music playback; software as a service (SaaS) services featuring software for digital audio stream playback; software as a service (SaaS) services featuring software for simultaneous and non-simultaneous music playback on devices on the same network or via cloud infrastructure; software as a service (SaaS) services featuring software for web-based playback of radio programs; software as a service (SaaS) services featuring software for music streaming services playback; software as a service (SaaS) services featuring web based playback control and, relative user interface for music playback; software as a service (SaaS) services featuring software for automatic, updatable and time-dependent music playlist scheduling and playback; software as a service (SaaS) services featuring software for universal plug and play (UPnP\DLNA) music playback; software as a service (SaaS) services featuring software integrated in a cloud-based computer operating system optimized for digital music playback; software as a service (SaaS) services featuring software for on-demand remote and local digital music playback; software as a service (SaaS) services featuring software for interactive music playback for home use and businesses; software as a service (SaaS) services featuring software for point-to-point music streaming; software as a service (SaaS) services featuring software for multi-point music streaming; software as a service (SaaS) services featuring software for digital signal processor (DSP) and digital room correction, namely, digitally correcting a room's acoustics; software as a service (SaaS) services featuring software for integrated playback of music services and media files; software as a service (SaaS) services featuring software for music playback system for businesses for customer fidelization, namely, software for tracking repeat customer interactions with the system