Alana Haim and Este Haim are expected to be back at Madison Square Garden for Taylor Swift's wedding. Geoff Burke / Imagn Images Taylor Swift is getting married (supposedly). The bard of a generation’s pop romance is saying “I do” (reportedly).

It’s the moment when the newlyweds, fresh off their vows, take to the dance floor to share a special song that reflects their love story, values, and hopes for the future. But where did this tradition come from? Historically, the first dance dates back ...