I can get the URI for a track, no problem.

I can get the URI for a playlist, no problem.

But I can't in the general case figure out how to get the URI for a track that's in the context of a particular playlist. 

I'd like to be able to start my player at a particular place within a playlist (say, start at track number 3 instead of the first track), or to start the web player this way.

Does anyone know how to do this?

Thanks,

Chris

P.S. Using the "in context" bit in AppleScript, I can get Spotify to play a particular track within a particular playlist. This is cool, and it works. However, I can't for the life of me figure out how to do that with a URI in the general case.