Damian Woetzel, artistic director of Vail Dance Festival, spoke on a panel at Aspen Ideas Festival on June 29, along with Charles Yang and Caroline Shaw, about music — and what it might sound like in 250 years, in alignment with Aspen Ideas’ theme: Declarations of Independence: Past, Present and Future. While Woetzel celebrates his 20th year as Vail Dance Festival’s artistic director, both Yang and Shaw are no strangers in Vail; both have been m…