Not only is it a recording of the fire at the Montreux arena, it has the complete Sofa Suite. Aside from the audio quality, (the vocals sound hollow and tinny and the P.A. system eats it at the end of Peaches En Regalia), this album is a prize in my Zappa collection.The surprising improvisations by Howard Kaylan and Mark Volman, the humor, the ethos, the pathos, the Porthos, the Aramis,the Brut Cologne. But I digress...Great album.