When you buy through our links, Business Insider may earn an affiliate commission. Learn moreHeadlines for Outside Lands include The Killers, Sabrina Carpenter, Sturgill Simpson, and a special country set by Post Malone.Amy Harris/Invision/AP; Kevin Mazur/Getty Images; Al Wagner/Invision/APAs one of the area's largest music festivals, Outside Lands brings a mix of San Francisco culture infused with three days of music, art, and food.