This is an excerpt from the now famous Jim Ladd interview that appeared on syndicated radio and in another form, as a segment on Don Kirshner's Rock Concert. This is the source of Dave's version of the Humble Pie tune "79th And Sunset", which is included.
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While looking around for more info on this, I discovered this page from the ARMY, obviously from back in the days. Not sure if the links are working (some of this stuff isn't allowed at work), but it is interesting to check out, nonetheless: DLR Audio Interviews