Singer, guitarist, rhymer—Stoney shows Post Malone is a triple threat. He incorporates folk and hip-hop in a way that blurs the lines. The good times he rap-sings about on “White Iversons” and “Go Flex” belie a vulnerable streak. One can make out confusion and regret through the foggy windows of “I Fall Apart” and “Feel.” Kehlani, 2 Chainz, Quavo, and Justin Bieber add hearty cosigns.