Wilson signed the Mothers to the Verve division of MGM, which had designed up a sturdy status for its releases of modern-day jazz recordings in the nineteen forties and nineteen fifties, but was making an attempt 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 over the tape, he was arrested, and the police stripped the studio of all recorded materials.