Last year (2023) was a banner one for Sabrina Teitelbaum, aka Blondshell. Her self-titled debut LP gained new fans and received critical acclaim — one of the songs from that album, “Joiner,” even earned a coveted spot on Barack Obama’s year-end playlist. Her band has been touring extensively, and this summer found them trotting around the globe on the festival circuit while putting together a sophomore album.   “What’s Fair” is a new pop-punk song that’s been lighting up their live sets as it grapples with the complexities of mother/daughter relationships.