P!nk and Rob Thomas look to country for inspiration as they put out new tracks — one a pop anthem, one a rock anthem — that are both reflective and uplifting in turn. Kehlani’s new mixtape is pure R&B bliss, all buttery slow james. Grammy-nominated rapper Tierra Whack finally puts out a song that clocks in at more than a minute, with great results. And James Bay and Julia Michaels team up for a sweet, intimate love lullaby packed with vulnerability.