“Midnight Hour” was first played at Brownies & Lemonade Miami Music Week 2019. Though officially released as a Skrillex song, the track is a collaboration with Boys Noize, who when paired with Skrillex make the group Dog Blood. Vocals are provided by frequent Skrillex collaborator and singer Ty Dolla $ign.

Since the first preview, the song has consistently changed, relying on samples for the drops' basis. After being performed at various festivals by Skrillex and friend Four Tet, plus recent OWSLA signee Salvatore Ganacci; the track was finally released on August 29th, leaking two weeks prior through digital store Beatport. The final version interpolates Cassie’s “Long Way 2 Go” in the chorus and samples the City Girls' “Act Up.”