One of the game's composers Colin Anderson, a life-long fan of progressive rock, had originally planned to include a prog rock radio station called "Ridiculous FM" that played "Regressive Rock", the joke being that it would play a single multi-part prog suite that was longer than any of the other stations in the game on an endless loop. Although this idea was cut from the game due to time constraints and the team feeling it was inappropriate for the game's setting, Anderson would regularly think about what the song would have been like until 2015, when he completed it with the help of several consultants and recorded it with the aid of vocalists and a live drummer. The final product, a 20 minute 16-part song called "YTZ", was released under the name Aori, a duo with Anderson and singer/lyricist Neil Horsburgh. "Aori" was previously the title of a song also written and released by Anderson under the name Ashtar that was featured on the Radio '76 FM station in Grand Theft Auto. Additionally, the song title "YTZ" is a reference to the instrumental "YYZ" by the prog band Rush; both names are airport identification codes used by airports in Toronto, Canada, and both songs feature Morse code messages spelling their respective song titles.