With so much good music being released all the time, it can be hard to determine what to listen to first. Every week, Pitchfork offers a run-down of significant new drops available on streaming services. This week’s batch includes albums from Robyn, Snail Mail, Chief Keef, and more. Subscribe to Pitchfork’s New Music Friday newsletter to get our recommendations in your inbox every week. (All releases featured here are independently selected by our editors. When you buy something through our affiliate links, however, Pitchfork earns an affiliate commission.) The title of Robyn’s first album in eight years, Sexistential, started off as a joke. But the pop savant soon realized the goofy portmanteau spoke quite seriously to her current state of mind. “I feel like the purpose of my life is to stay horny,” Robyn said in press materials.…