Named the 'Un-Concert' by Zappa himself, the various live recordings featured on this deluxe vinyl release come from a host of venues played by Frank and his then-mothers during their 1973 tours of the US, Canada and Australia. In large part recorded between June and December that year, Mother Superior Frank then chose to provide WLIR-FM New York with his own reels to broadcast this selection of rare diamonds across the airwaves on New Year's Eve 1974. The results are quite astonishing as can now be heard on this LP, featuring the entirety of the Zappa reels as were transmitted on that now legendary radio show.