The annual Burton U.S. Open snowboarding competition announced its musical lineup Monday for its free four-night concert series in Vail at the end of February. This year’s bands include eclectic and experimental band tUnE-yArDs, Michigan’s Greensky Bluegrass, the Texas trio Khruangbin and Brooklyn-based Turkuaz. The concert series starts Wednesday, Feb. 27, and run through Saturday, March 2. The annual Burton U.S.