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Why has it not happened yet? The songs are really pretty especially the second one, which has a drum and bass vibe. Every single HW primal has music, except for that one. Why is that? Do people just not like the fight? We're the weapons too ugly? Is his mount unfavorable? It feels like all he had going for him is the music, and SE skipped that.
New Orchestrion scrolls are added all the time. In 3.4 we got Shiva and Ramuh primals added to the list. In 3.5 we'll probably get even more and not the mention they will keep adding more during the next expansion and after.
It'll be added eventually, you just need to be patient. I'm waiting for the various Garlean themes to be added to the orchestrion - particularly 'Imperial Will' - but it hasn't happened yet. Each new content patch adds a decent amount to the game though so you can count on seeing it someday.