MacArthur “Genius” grant winner Raven Chacon will be at Macalester on Saturday for a performance of the Diné composer’s “American Ledger No. 1,” a work composed in 2018. Performed by an ensemble of Twin Cities musicians and Macalester students, the work explores the United States’ violent history. Published on Chacon’s website, the score is very visual, and the composer notes that as part of the work, it should be displayed as “a flag, a wall, a blanket, a billboard, or a door.”