The rollout distance was and took 61 seconds. This also marked the first use of carbon brakes. "Discovery" returned to KSC on 7 May 1990. NASA began a tradition of playing music to astronauts during the Gemini program, which was first used to wake up a flight crew during Apollo 15. Each track is specially chosen, often by their families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.