Fascinating fact:

Kanye West and Macklemore & Ryan Lewis are set to headline the 2014 Outside Lands Music & Arts Festival this summer (14). Tom Petty & The Heartbreakers and The Killers will also serve as headliners for the three-day festival, while Arctic Monkeys, Tiesto, Disclosure, Kacey Musgraves, and The Flaming Lips are among the other performers set to take the stage at the Golden Gate Park event in San Francisco, California, which will take place from 8 to 10 August (14).