A seriously important festival of Morton Feldman’s late music here in Philly, June 4 through the 12. Curated by Bowerbird and called “American Sublime” (quite elegant website), the programs include pieces like Triadic Memories. Crippled Symmetry, and the six-hour-long String Quartet #2. Performers include heavy-hitters like Marilyn Nonken, the Jack Quartet, Joan LaBarbara, and more. This is an uncommon series of events, presenting important music that is new to the area. Read the article that inspired the title of the festival here.