Ruby on Rails Music Store Project

Need to develop online music store to sell MP3's. I want the website to be programmed using Ruby on Rails using some AJAX and MySql. I have a server Rails & Ruby ready w/ MySql. Site should have an admin section for me to control the front-end, it should be clean and easy for the consumer to use. It needs to have an internal music jukebox, that keeps track of the users previous listens, similar to wimpy player. I have a sketched out diagram on how I vision the front end.