If you enjoy unpredictable, scatalogical humour, then this album is for  you.  It features Zappa's "Flo and Eddie" comedy line-up, whereby  the jokes are more out there and in your face rather than contained in the  music itself.  This concert features the famous "Groupie  Routine", which shows the band acting out a scenario depicting life on  the road in the form of a mini-opera which dominates the majority of the  record.  Also featured here is the legendary "MudShark" story,  which will either amuse you or confuse you.  The music here rocks, but  isn't as polished as Zappa's other more technically superior bands'  performances.  The album highlight for me is a rousing version of the  Turtle's "Happy Together", incorporated as a finale to the  "Groupie Opera" string of songs.  So, if you're not easily  offended, time-travel back to June 1971, and make a stop at the Fillmore  East to witness a truly crazy performance from Zappa and these Mothers of  Invention.