A tribute to John Denver -- A Rocky Mountain High Earth Day Celebration -- in celebration of his life and music on April 21, 2011. Hosted by Olivia Newton-John and playing John Denver's hits include performances by Nitty Gritty Dirt Band, Lee Ann Womack, John Oates, Olivia Newton-John and Richie Furay, and featuring members of John Denver's Band and the Boulder Philharmonic conducted by Lee Holdridge..