R.O.C.K. (Relying on Christ the King) Radio is an online radio station that plays the best Christian rock and hip hop music on the internet. ... See more Andrew Johnson and David Marshall began R.O.C.K. Radio in 2005 when Kansas City lost a great Christian rock radio station. Together, they wanted to do something for the teens of Kansas City. R.O.C.K. Radio is now heard over the internet to people across the world.