What is Halsey's Introduction song that plays before she appears on stage?

So I was just thinking about whether Halsey will possibly tour in the UK next year. And I was just thinking, bands like The Stranglers, Green Day, Iron Maiden and Avenged Sevenfold all have introduction songs. For The Stranglers it's "Waltzinblack", for Iron Maiden it's "Doctor Doctor" a cover of a UFO Song, Green Day has "Blitzkrieg Bop" by the Ramones with Punk Bunny dancing on stage, and Avenged Sevenfold sometimes have Back In Black. They also have songs on the PA after the show ends, for The Stranglers it's "Meninblack", Iron Maiden it's "Always Look On The Bright Side of Life".

So I was wondering, if she tours, does she have an Introduction song and an after show ends song? Just wondering because it would be nice to know. Has she ever done this?