how is time used to control? how is music used to control?

According to Bromden Nurse Ratched can set the wall clock at whatever speed she chooses just by turning a dial in the door. She generally slows time down to keep the patients at her mercy. Meanwhile, the speakers on the ceiling are playing music loudly. Music becomes a substitute for news or anything intellectually stimulating. McMurphy complains to Harding, who explains that they hear music nearly all the time, but never the news because the news might not be therapeutic.