Actually, this is a very good performance from probably the most maligned phase of The Mothers, and particularly, Frank Zappa's, career. The 1970-71 tours and records, were actually, very funny, and full of a hidden virtuosity, hidden by the antics of Mark Volman and Howard Kaylan (Flo & Eddie). Their voices can be shrill, and grating to people with more middle-of-the-road tastes, but that's the irony and beauty of it all. Those voices once fronted a very popular "pop" group, The Turtles, and the sleeve notes from The Mother's "Freak Out," from 1966, had a quote from an A&R man, saying he could clean them up a little, and make them as big as The Turtles. So, when the original band broke up and a new, revamped line-up appeared and they were hired, it kind of showed them who knew what.