For some, their first musical memory might be a favorite song playing on the radio, a video on MTV, or a concert their parents took them to. But for 22-year-old singer-songwriter-guitarist Lukas Nelson, his first music memory is being onstage with such superstars as Johnny Cash, Waylon Jennings, Kris Kristofferson and his father Willie Nelson singing along and stomping his feet to a crowd of thousands. "I was out on the road with my dad when he was doing the Highwaymen with Johnny Cash, Waylon Jennings, and Kris Kristofferson.