Songs double as life lessons on “Sesame Street,” from an alt-R&B-pop track about gratitude with SZA to an acoustic number about feelings with Rapp. “SZA is really cool — really talented. And ...

When I think of potential Reneé Rapp crossover events, Sesame Street is not necessarily the first thing that comes to mind. And yet, seeing the Mean Girls star sitting next to Elmo, as she was in ...