The 2018 lineup for the Firefly Music Festival, the giant weekend-long gathering held June in Dover, Del, has been announced.

This year, it packs a one-two hip-hop punch: The top line headliners at the fest which runs from June 14 to 17 in the verdant Woodlands of Dover International Speedway are rappers Kendrick Lamar and Eminem, plus Las Vegas arena rock band The Killers — who happen to be playing the Wells Fargo Center on Saturday — and Brit rocker Arctic Monkeys.

The hip-hop heavyweights are the big deal: Lamar, who played a Firefly afternoon slot in 2013, returns with a reputation as the greatest rapper alive and his latest acclaimed album, DAMN., up for seven Grammy nominations later this month.

Eminem's late breaking 2017 album Revival was a serious disappointment, but the Detroit rapper remains enormously popular. He's also headlining Coachella and Bonnaroo, the mammoth annual spring festivals whose lineup were announced earlier this month.

Second level attractions at this year's Firefly include EDM acts Odesza and Martin Garrix, plus rappers Lil Wayne and Logic, alt-R&B singer SZA (who plays the Fillmore on Jan. 31) and alt-rockers Alt-J.

Philly-connected acts making the bucolic Woodlands scene include pop duo Marian Hill, now Nashville based guitar Ron Gallo and rising hip-hop star PnB Rock, who also plays the Fillmore this Saturday. Gallo is also on the Bonnaroo and Coachella lineups, a distinction he shares with Philly band Japanese Breakfast (ho isn't playing Firefly). Philly band Low Cut Connie is also playing Bonnaroo. Got that?

Other acts of note on this year's Firefly less than eye-popping undercard: Australian songwriter Alex Lahey; 2017 breakout pop act Portugal, The Man; Richmond, Va. songwriter Lucy Dacus (whose new album Historian is due March 2) and the Beastie Boys' Mike D., who's doing a DJ set.

Passes for the festival, which caters to campers as well as commuters, go on sale at 10 a.m. on Friday.