Custom Project player/music site

I am setting up a blog in buddypress that is going to be a platform for independent artists. I have hosting set up & I am taking a course from [login to view URL] for putting the site together, but I need help with the design of a player that will integrate with artists pages/shopping cart as well as to not just stay on the main page but any page that users visit, that way they can add songs for purchase to the playlist. Does this give you enough information? You can see similar sites like [login to view URL] and [login to view URL] except my site will not have any of those songs- unless those users join my site Thanks