In its blog post on Sunday, Rhapsody, the subscription music service and a Real Networks’ division, has said that it intends submitting a review application to Apple, in connection with the porting of its service to Apple’s iPhone and iPod Touch. It has been reported that Real Networks has sent the iTunes App Store a free app that entails a $15-per-month Rhapsody subscription music service to the iPhone.

For the subscribers of Rhapsody-to-Go, the Rhapsody mobile app will enable the ability of exploring and streaming Rhapsody’s entire online music catalog over EDGE, Wi-Fi, or 3G. In addition, users can also create and store playlist queues of their choicest content, though they can cannot download and store Rhapsody songs straight on the device, or cache content in the short term for offline hearing later on.

Though conventionally, Apple, fearing unwarranted competition for its iTunes music service, has essentially avoided subscription music, the success of iPhone music apps - like Pandora, Last.fm, and Slacker – have likely paved the way for subscription services.

In case Apple approves the Rhapsody application, competing services, like Spotify and Napster, will follow suit. What remains to be seen then is whether users will find subscription music capabilities worthwhile; more so with the presence of free, ad-supported services like Pandora, would users shell out extra money for Rhapsody’s unlimited on-demand music streaming!