What is the event scroll for Tiamat music?

I overheard someone say that one of the orchestrion rolls that are available in the event is the music that plays when you are around Tiamat in Azys La but Google is being absolutely retarded. Despite the fact that I Googled "FFXIV Tiamat Music" Google is ONLY providing results for everything but Tiamat. Google shows results for Titan, dungeon music, and other music and is EXCLUDING Tiamat is 99% of search results (A Tiamat wiki is the ONLY thing relating to Tiamat in search results but it DOES NOT tell me what her music is

Does anybody know what the name of it is? I do not want to waste my magitek parts buying every one just to find the right one

The music that plays around Tiamat is the same music that plays for the final boss of Keeper of the Lake, Sohr Khai, and Alphascape V2.0(O10). The tracks name is Primogenitor and only drops from Alphascape V2.0 but can be purchased from the market board from other players. All of the orchestrion rolls for the FFXV crossover event are songs from FFXV.