After the Grateful Dead's final 50th anniversary shows in 2015, filmmaker Justin Kreutzmann (son of the Dead's drummer, Bill Kreutzmann) realized that, for the first time, he and his dad could forge a relationship outside the shadow of the band. This inspired Justin to sit down with the world's greatest drummers, in the hopes of better understanding both his father and the instrument that has defined his life. Along the way, "Let There Be Drums!" examines the personal struggles that so many of these musicians and their families have faced, the nature of how music passes from generation to generation, and the essential role that drumming plays in human life.—WJK