The Roots are having a big year, having just been promoted from Late Night house band to Tonight Show house band. And now they’ve announced plans to bring their Roots Picnic festival back to Philadelphia for the seventh time. As usual, the Roots will headline, and they’ll also back up Snoop Dogg on a co-headlining set. The typically eclectic bill will also feature a ton of artists in heavy rotation on ?uestlove’s iPod. The lineup includes Janelle Monáe, A$AP Ferg, Action Bronson, the War On Drugs, AraabMuzik, Jhené Aiko, Just Blaze, British dance stars Rudimental, and a DJ set from Biz Markie. The show comes to Festival Pier At Penn’s Landing 5/31.