Keeping track of all of the year's upcoming musical festivals can seem like a daunting task. But you can relax, because we have you covered. Staying true to the 5 W's [who, what, when, where, why], we have compiled the must-see acts and where they are heading this spring/summer. And let's face it, between the OutKast Reunion, Miley's rumored attendance and Lana del Rey's final performance, you're going to want to stay in-the-know and grab your tickets early. So grab your best gal pals, your favorite flower crown headpiece and and click through to see the hottest headliners at the biggest music festivals this year.