Yeah, you should be able to go here
and select the bottom 'Listen Now' (where it says 808 State Plus Support).
808 are an hour into the stream, so you either can listen to Nils Lofgren, Ash and PJ Harvey, or do what I did (!) and keep pressing the 'Skip' button until about 55 minutes/an hour.
As John says, though, it disappears after tonights show - wish I'd noticed it sooner!