Wilson signed the Mothers to the Verve division of MGM, which had created up a powerful standing for its releases of modern day jazz recordings in the 1940s and 1950s, but was making an attempt to diversify into pop and rock audiences. 80-81 Studio Z was almost never booked for recordings by other musicians. When Zappa was about to hand over the tape, he was arrested, and the police stripped the studio of all recorded substance.