Pop artist Jax has the answers. “One night I said screw it, I’m just going to just be my nerdy, dad-joke-telling self,” Jax explained. “So I put on a bathrobe, wrapped my head in a towel, channeled my Long Island mom and wrote ‘Stacy’s Mom’ from the point of view of Stacy’s Mom.” With a carefully tuned ear for mimicry and an incisive wit, she turns classic earworms on their heads, detailing everything from the Yelp review for “Hotel California” to, how the guy stuck behind Olivia Rodrigo in “Driver’s License” feels. As fun as her account is, it almost didn’t exist at all. The 25-year-old Los Angeles-based singer battled cancer above her vocal cords — twice.