So I’m a big Taylor fan, like everybody else I suppose, and I heard the snippet that they played on Good Morning America. […] It was just a small tidbit and I texted Jack [Antonoff] — Just to make it very clear we’re not like best friends or anything. […] He’s always been nice to me and we exchanged information. […] So when I heard this one song I was like “Oh man, this is cool. It sounds like —” forgetting that Jack had worked on it, I was like “Oh man, this sounds like a cool Bleachers cover done by Taylor Swift.” I texted him and I looked it up, and it turned out that he had actually co-written and produced the song with her, so I was like “Hey man, this sounds great. I’m glad to hear it.”
Darren Criss on Taylor Swift’s "Out of the Woods" (x)