What is the fine-grained topic of the following text: Sony’s decision to offer the service, touted as the Japanese company’s answer to Apple’s iTunes, on iOS devices speaks to Apple’s presence in the all-important smartphone and tablet markets as well as Sony’s willingness to do whatever it takes to expand the reach of its content services.The Music Unlimited service, along with Sony’s video and videogame offerings, functions as the glue holding together the links between the Japanese conglomerate’s entertainment businesses and electronics products. Only return the topic.
Sony's decision to offer Music Unlimited service on iOS devices