Help with audio timeline

I'm just soliciting ideas in advance of my own research - I need to build an audio timeline for this application I'm making. So what I want is to be able to determine the length of an audio clip (a music file) and then display a timeline like a ruler across the window that the user can click on to select a point in time of the clip and then I have to be able to make the clip play from that point. From my experience with the alx functions, I don't know if this is possible. Perhaps there's a resource floating around out there? Any help would be appreciated as I do my own searching.