In 1906, Denver's Pietro Satriano and his 25-piece brass band became the first musical act to perform at Red Rocks Amphitheatre, then christened the Garden of the Titans. Over a century later, Denver is a must-stop for every nationally touring act, and Red Rocks, set deep into the towering red rocks of Morrison, Colorado, is heralded as America's most important outdoor music venue. From the Grateful Dead to Willie Nelson, every star in the musical...