Whether or not you’re familiar with Jack Antonoff by name, you’re guaranteed to have had his music stuck in your head over the last seven years. Here's ten songs he's helped write and/or produce, from Lorde, Taylor Swift, Sia, fun. and more.
Forget surprise releases -- if new Halsey music doesn’t come with a treasure map and a secret code, it’s like it never happened. We tried to piece together the clues she's left us towards her upcoming 2017 sophomore album 'Hopeless Fountain Kingdom.'