Taylor Swift performs at Z100 Jingle Ball at Madison Square Garden, Friday, Dec. 12, 2014, in New York. (Photo by Evan Agostini/Invision/AP)

NEW YORK (AP) — If you wanted to make a time capsule of what happened in pop music this year, Friday night’s Jingle Ball — the annual extravaganza held in Madison Square Garden put on by pop station Z100 — would most likely provide the most accurate account.

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