I don't know Black Flag's music well or listen to Henry Rollins show on Indie but I have to admit his Teeing Off from his Henry Rollins show on IFC is great. They are informative and bitter and funny and ranting. If you get a chance watch a couple of them. My personal favorite is the Teeing off from Ep. 3 about Americans living above and beyond their means. Try this link and click on that Ep if you can find it.