Wilson signed the Mothers to the Verve division of MGM, which had designed up a sturdy standing for its releases of modern jazz recordings in the 1940s and 1950s, but was attempting to diversify into pop and rock audiences. 80-81 Studio Z was not often booked for recordings by other musicians. When Zappa was about to hand about the tape, he was arrested, and the police stripped the studio of all recorded product.