Photo of Ariana Grande by Dana Edelson

Mystery solved! Ariana Grande is one of the artists behind the untitled track set to appear on the forthcoming Hunger Games: Mockingjay - Part 1 soundtrack.

The singer revealed in a live stream with fans on Tuesday that she contributed to the soundtrack in the form of a collaboration with Diplo and Lorde, the latter of whom curated the set and also appears on multiple tracks.

Grande spared much detail about the track, only informing fans that it's "a very interesting song. It’s very different.”

The soundtrack, of which the tracklist was revealed last week, includes new material from Miguel, The Chemical Brothers, HAIM, CHVRCHES, Pusha T, Raury, Tinashe and more. As we mentioned, track 5 is simply listed as such, without a title or artist credit.

Lorde said the track wasn't intentionally meant to be kept a secret: "It's just not quite finished," she said on Twitter.

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