From a bare, rocky hillside near Denver one night last week came such sounds as the great U.S. outdoors had seldom heard. They emanated from Soprano Helen Jepson, a 100-piece orchestra and a 100-voice chorus. Denver's Theater of the Red Rocks has acoustics so good that the 20,000 people who can sit on its slopes can hear perfectly without amplifiers.
The same forces that spewed up the Rocky Mountains, millions of years ago, turned edgewise a huge ledge of red sandstone, 15 miles from Denver. At right angles to the rock, on the rising hillside,...
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