- captain beefheart: transmission impossible
(2015, 3cd, uk, eat to the beat ettb059)
So, no, this hardly can be called an 'official' album.
And, yes, it does offer a fine set of recordings..
 1966/06/17 radio broadcast from the avalon ballroom, san francisco, ca, usa
 1967 / 1968 various radio sessions
1974/04/22 live radio broadcast from the cowtown ballroom, kansas city, mi, usa
 1981/01/17 radio broadcast from the commodore ballroom, vancouver, canada
 tubeworks wabx tv
 1975/11/01 kwst fm radio show broadcast with frank zappa
 1980/11 "saturday night live"