 In 1973, they did the Hollywood Radio Theater theme for the Rod Serling radio drama series, "The Zero Hour".The duo also experimented with prepared pianos, adding paper, sticks, rubber, wood blocks, metal bars, chains, glass, mallets, and other found objects to piano string beds.In this way they were able to produce a variety of bizarre sounds that sometimes resembled percussion instruments, and at other times resulted in special effects that sounded as if they were electronically synthesized.