Details: When Yanni selects an ancient backdrop for a performance, the result is spectacular; Live at the Acropolis sold 7 million albums worldwide and the PBS Special was seen in 15 million households (the accompanying home video sold 1 million copies in America, becoming the 3rd best-selling video of all time). Tribute is a musical testament to human potential, inspired by 2 sacred sites: India's Taj Mahal and China's Forbidden City in Beijing. PBS will air a 90-minute film documenting both concerts beginning early Dec. '97.