In the 1930s, Stalin and his advisors decided that all of the arts would be subject to a sensor to decide if it propagated a socialist agenda. Under Soviet rule during the Cold War, jazz and rock'n'roll was completely forbidden in Russia. Russian jazz musicians were even arrested and sent to gulags. But one Polish man named Stanislav Philo changed the game. He opened up shop in Soviet Russia with a device that records sounds onto records. His business blew up during the music ban, because he was a bootlegger. People came to Philo to record banned gramophones onto X-ray film to secretly keep and play. The records were called "bone music" because they were X-rays of bones and people's insides with music printed on them.