The first disc documents Progress?, a one-off play performed at Royal Festival Hall in 1968. Featuring musicians from the BBC Symphony Orchestra, it contains some quality hipster satire (i.e. "here in London, you're not going to get any p*ssy unless you look like a pop star"). The second disc, in contrast, captures a typical Mothers performance from the same era. Sound fidelity isn't the best, but there's some killer jams to be explored. "The Orange County Lumber Truck (Part II)" might be the best of the bunch: pure greaser groove and longhair riff-riding like early Alice Cooper and UFO.