Jack Antonoff Reveals How He Wrote "New Year's Day" with Taylor Swift

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Jack Antonoff shares his writing process and explains why he wasn't nervous writing a song with Taylor Swift.

Appearing:Jimmy Fallon
Tags: The Tonight Show, Jimmy Fallon, Jack Antonoff, reveals, How, Wrote, new year's day, taylor swift
S5 E864 minInterviewTalk and InterviewLatenight