Halsey’s new album Manic features guest appearances by an assortment of musicians – including a guest appearance comes from John Mayer who isn’t singing or playing guitar.

At the end of the song “3am,” you hear an answering machine message beep, and then a guy’s voice raving about one of Halsey’s singles.

“Your best song is a song that’s currently on the radio. How many people can say that? That their best song is the one that’s currently about to be a massive hit?” asks the voice. “It’s already a hit. It’s just gonna get more massive. How many people can say it? Not very many. Congratulations!”

When a fan asked if the voice was Halsey’s dad, the singer replied, “It’s @JohnMayer ! Haha,” she wrote, before going on to share that the voicemail was left following the success of her 2018 song “Without Me,” which reached No. 1 on the Billboard Hot 100. “He predicted the success of without me before I had faith in myself,” she explained.