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Taylor Swift, 1989 Album Cover

First there was "Shake It Off."

Then there was "Blank Space," "Style" and "Bad Blood (feat. Kendrick Lamar)."

So, what's next? Taylor Swift announced some music news overnight, telling her 61.6 million Twitter followers, "Just wanted to let you know that the next single from 1989 will be........... Wildest Dreams." The singer did not offer additional details.

The song uses a recording of the pop star's own heartbeat.

Swift wrote the song with producers Max Martin and Shellback.

Speaking to NPR last year, Swift said, "In the past, I've written mostly about heartbreak or pain that was caused by someone else and felt by me. On this album, I'm writing about more complex relationships, where the blame is kind of split 50-50. I'm writing about looking back on a relationship and feeling a sense of pride even though it didn't work out, reminiscing on something that ended but you still feel good about it, falling in love with a city, falling in love with a feeling rather than a person. And I think there's actually sort of a realism to my new approach to relationships, which is a little more fatalistic than anything I used to think about them. I used to think that, you know, you find The One. It's happily ever after, and it's never a struggle after that. You have a few experiences with love and relationships, and you learn that that's not the case at all. Lots of things are gray areas and complicated situations, and even if you find the right situation relationship-wise, it's always going to be a daily struggle to make it work. So those are different themes that I don't think people have really seen in my lyrics before."

"Wildest Dreams" is an example of that, she explained.

"If I meet someone who I feel I have a connection with, the first thought I have is: 'When this ends, I hope it ends well. I hope you remember me well.' Which is not anything close to the way I used to think about relationships," Swift said. "It's that realization that it's the anomaly if something works out; it's not a given."