Unreleased "S10 Cine" Music Pack

Unreleased

This Unnamed Music Pack was first leaked on August 1st, 2019. Judging by its icon and ID, it might have been a remix of the tune heard in the cinematic trailer for Season X.

Origins & Proof

 * August 1st, 2019: With the beginning of Season X, the official Fortnite website was updated, and so was its Battle Pass page. In-game, the The Final Showdown music pack was the Tier 12 reward from the Battle Pass; whereas the website showcased the icon of a different music pack, that had not been added into the files yet. Epic Games later corrected the Season X Battle Pass page, and replaced the mysterious music pack with the correct one.
 * September 4th, 2019: A massive cosmetic ID datamining occured after the Patch 10.20.2 update. It leaked a huge load of IDs of scrapped and upcoming cosmetics, such as TNTina and Dummy. In between those blacklisted IDs, there was one intended for a music pack, MusicPack_021_S10Cine.
 * The chances of this ID being intended for the mysterious music pack are high, since it follows the codename pattern that Epic Games uses for songs originating from cinematic trailers; such as "014_S9Cine", "044_S12Cine" and "056_S14_Cine".
 * August 19th, 2021: A similar massive ID datamining occured, and a popular dataminer; known as @iFireMonkey, shared a pastebin compiling all of the blacklisted IDs that had been leaked. It not only featured even more IDs for scrapped cosmetics, but also featured "returning" ones from the past leak, being cosmetics that have yet not been added into the game since then. One of the returning IDs was the MusicPack_021_S10Cine.
 * As of now, a music pack with the ID number of "21" is notably missing between music packs 20 and 22 in the Fortnite: Battle Royale files.

Conclusion

 * This music pack was intended for the Season X Battle Pass as the Tier 12 reward, but was replaced by The Final Showdown music pack.