Matt Helders of the group, his vocals have been featured on many of the band's songs. He often sings in response to or in harmony with lead singer Alex Turner, and sings lead vocals on "D Is for Dangerous", "Brick by Brick", and "I.D.S.T.", as well as on parts of "You Probably Couldn't See for the Lights but You Were Staring Straight at Me", "Who the Fuck Are Arctic Monkeys?" and "Teddy Picker". Also, during two shows of the North American leg of the band's "Humbug" Tour, he sang an interpretation of Wham!'s "Last Christmas" during an encore performance of "Fluorescent Adolescent".
Tranquility Base Hotel & Casino father at the age of eight, commenting that he "never thought [his father's influence] would find its way into [his] compositions as much as it has on this record". Many of the vocal takes included on the finished album originate from Turner's home demos on a TASCAM 388 8-track recording machine. Guitarist Jamie Cook commented that he "was blown away by the direction Alex had gone in" when Turner played him the demos in February 2017. Initially unsure how they would record the songs, Cook suggested Turner release it as a solo album, but Turner was uninterested. Cook began recording