Halsey brought G-Eazy and Lauren Jauregui to her ‘safe space’ at the Forum

Standing onstage Friday night at the Forum, Halsey paused between songs to shout out to her keyboard player, Greg Spero, a stalwart collaborator who’d been with her, she said, since her first real concert, at the Troubadour in Los Angeles.

That was two and a half years ago.

Things have moved quickly…