Who is popular today?

It opens with a clock counting down until show time — the dropped stomach, rollercoaster slowly encroaching its apex sensation — and then, a gentle fake out. Taylor Swift is heard before she is seen. “It’s been a long time…” her voice carries. Then the drop hits: an abridged performance of “Miss Americana & the Heartbreak Prince” into “Cruel Summer,” a track that TikTok breathed new life into four years after its initial release on her 2019 album “Lover.”