Pop-music hit machine Charli XCX hasn’t put out an official LP since Sucker in 2014, but in that two-year span she has churned out a truckload of addictive tracks with help from a seemingly endless Rolodex of collaborators. When Charli hangs out with friends are they ever just sitting around and talking, or does every rendezvous produce a new jam? While you ponder that question, listen to Pop 2, her second mixtape of the year after dropping Number 1 Angel in March. She’s joined by Carly Rae Jepsen, Brooke Candy, CupcakKe, Mykki Blanco, MØ, and more.