
If you are trying to buy the Persona 5 Royal EX BGM Set for Persona 3 Reload, the confusion you are running into is real and it has a clean answer: there are two near-identically named DLCs, and almost every storefront mix-up comes from people buying the wrong one. The EX BGM Set is not the cheap standalone pack you may have seen for a few dollars. Here is exactly what each product is, what is on it, and how to switch the music on once you own it.
The reason track counts and prices never match across store pages is that you are looking at two separate SKUs that share almost the same name. Sort them out once and the rest of this is easy.
So when one page says “6 tracks, $3.99” and another says “8 tracks,” neither is wrong. They are describing different products. If you specifically want the EX set, the Expansion Pass is the only way to get it, and it is not folded into any higher-priced game edition.
This pack imports Persona 5 Royal music into Persona 3 Reload and plays it during real gameplay — Tartarus exploration, battles, and the results screen — not as a side jukebox. The eight tracks are:

Life Will Change — dungeon BGMBeneath the Mask — dungeon BGMKichijoji 199X — dungeon BGMGentle Madman — dungeon BGMI believe — dungeon BGMKeeper of Lust — battle BGMBlooming Villain — battle BGMVictory — results screenTwo things people get wrong here. First, the results track is Victory, not “Triumph” — “Triumph” is the results track on the other (6-track) set. Second, songs like Last Surprise, Take Over, Rivers in the Desert, Jaldabaoth, and Throw Away Your Mask belong to the standard 6-track P5R BGM Set, not the EX set. If you see those on a listing, you are looking at the cheaper standalone product.
Before you open any store page, decide which set you actually want, because the two are not interchangeable and only one is cheap.
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Once the DLC is active, switching the soundtrack takes about ten seconds — but the option lives in a specific place, and it only appears once you are actually in gameplay.
Change Battle BGM sits directly above Change Difficulty.If you hear no change at first, that is normal: the swap shows up when the next combat or exploration track triggers, such as a fresh battle or a results screen, not the instant you back out of the menu.

Almost every problem here is an entitlement or menu-location issue, not a bug.
Change Battle BGM only appears under Config > Game System Settings during gameplay, not from the title-screen Config.Victory; “Triumph” belongs to the 6-track set.Decide which product you want first, because the names hide a real gap. The EX BGM Set is 8 tracks and only comes with the $34.99 Expansion Pass — worth it if you want the full Persona 5 Royal music wave inside Tartarus. The cheaper $3.99 standard set is 6 tracks and is the one most people actually mean. Buy the right SKU, check your edition so you do not double-pay, then enable it under Config > Game System Settings > Change Battle BGM during gameplay. That is the entire job.