User-Generated playlists from multiple pages of a site?

I am looking for a widget / plugin / script that will allow the end user to create a playlist of music hosted on multiple pages of a site.

I have seen plugins which allow the web admin to host tracks within multiple pages on a WordPress site. I have also seen plugins which offer a pop out playlist, so the user can navigate away from a particular page where the songs were hosted.

The most useful feature that seems to be missing however, is to allow a user to visit a particular page (e.g. artist’s profile page), add an hosted track from that page to a new playlist (within the pop out player), and then visit a second (artist profile) page and add a second track to the pop out playlist – without interrupting the music, of course.

Any help, be it a link to something that does exactly what I want, or a push in the right direction towards an API that will allow me to develop it, would be greatly appreciated.