The Colorado Symphony is keeping its work alive through its #PlayOn series, which lets people enjoy different kinds of performances until at least May 11. About three weeks ago the symphony shared a digital version of Beethoven’s “Ode to Joy” on YouTube, which quickly gained traction on social media, earning about 500,000 views. Other videos the organization has shared include bassoon excerpts from “The Sorcerer’s Apprentice” and horn-players performing The Police’s “Don’t Stand So Close to Me.”