“Glass House” is a collaboration between Machine Gun Kelly and Naomi Wild, mourning various dead artists and detailing problems with drug addiction and mental health.

The song leaked ahead of the album’s release, but it was not known whose vocals it contained. Many people thought that the vocals belong to Lana Del Rey, because MGK teased in October 2018 the song was recorded with her for the coming album. However, in an interview with Beats 1, MGK said that that album was deleted, and instead MGK made Hotel Diablo.

MGK said that the only one song that still exists from that erased album is this collab track with Lana, but he decided to not put it on Hotel Diablo. He continued:

That song lyrics-wise and sound-wise, that song can come out whenever and still be relevant … If anything, that one’s always there, but everything else I scrapped.