*The lineup has been announced for the 6th Annual Roots Picnic Festival, taking place June 1 at Festival Pier at Penns Landing in Philadelphia.

This year, the roster includes headliners and festival organizers The Roots backing Naughty By Nature for a full set, reports Billboard. Performers during the event include Grimes, Gary Clark Jr., Macklemore & Ryan Lewis, Solange Knowles, Joey Bada$$, How to Dress Well, Sonnymoon, Jennah Bell, Trinidad Jame$, Robert Glasper, Lushlife, DJ Premier, Hit-Boy, The Gaslamp Killer and araabMUZIK.

Shawn Gee, executive producer of the Roots Picnic who co-manages the group with Richard Nichols, explains that event organizers including Questlove and Black Thought spent months curating a lineup with promoter Live Nation.

“The hardest thing is catching acts that are just getting buzz so you can get them on the cusp,” Questlove told Billboard. “I thought instantly that Macklemore and Ryan Lewis were going to be poppin. And just on a hunch, I was like, ‘Alright.’ We hit them and they agreed. Sure enough, after the album came out, they just became unstoppable.”

The Roots attend the 5th Annual Roots Picnic held at Festival Pier at Penn’s Landing in Philadelphia, PA on June 2, 2012 in Phiiadelphia

Questlove uses the relationships he’s built on “Late Night with Jimmy Fallon” to handpick acts. “Now that we’ve worked at ‘Fallon,’ it’s more sweet than it’s ever been,” he said. “You have to keep in mind that the picnic started three years before we started with Jimmy Fallon. So the process in the beginning was really tough because we had to go through agents and managers. Once I realized that the real advantage of working at Fallon kind of cut the red tape, it allowed us to deal with the artists one-on-one.”