Composer David Ludwig wrote his piece "Pangaea" as a "prehistoric 'Carnival of the Animals.'" It's about a time in Earth's history when there was one supercontinent, a vast ocean and a frightening die-off that wiped out most species on the planet. Hear the haunting "Pangaea," performed at the Bravo! Vail music festival by Anne-Marie McDermott, Calder Quartet, Lyris Quartet, Aeolus Quartet and bassist Rachel Calin -- and get the story behind David's piece -- in the Season 2 premiere of Centennial Sounds from CPR Classical and Colorado Public Radio.