Classic rock, country and alt-rock will mix it up when Heart, Dierks Bentley and Third Eye Blind headline this summer’s Fair St. Louis, one of the biggest July 4 celebrations in the country.

Sister act Heart performs July 4, followed by “Semi-Charmed Life” rockers Third Eye Blind on July 6 and country star Bentley on July 7.

The free concerts are at 8 p.m. each night on the Gateway Arch grounds.

The three days of concerts mirrors 2011’s decision to feature concerts over three dates rather than two dates. Last year’s lineup featured the Steve Miller Band, Montgomery Gentry and Maroon 5, though the Maroon 5 concert was rained out.

The free Celebrate St. Louis Summer Concerts return July 13, July 14, July 20 and July 21 at Soldiers Memorial downtown. Acts will be announced in the spring.

New to Fair St. Louis is a partnership with the St. Louis Sports Commission, leading to the kickoff of two runs, a competitive four-mile run and a fun one-mile run. The Independence Day Runs are at 7 a.m. July 4.

The fair’s air show, which returned in an expanded version in 2011, is back at noon and 3:30 p.m. on July 4.