Pop Music on Instagram: "In the 2010s, it really felt like every big pop hit had a “na na na” hook somewhere in it. It became one of the decade’s favorite earworms — a simple, catchy filler that artists used to make a chorus feel bigger, catchier, and instantly sing-along friendly. From Ariana Grande and Rihanna to Katy Perry, Fun., and One Direction, almost every major artist dropped at least one track with that signature “nana” moment. It fit perfectly with the upbeat, festival-ready sound of