Quote Originally Posted by DamianFatale View Post
That makes no excuse, and I don't think anything is a lose cause. We bugged them about things like male viera and they added it eventually. Don't give up.
It absolutely is an excuse: if they don't have the room to add in special mount music from the banks they already have, then they can't add more. They've talked about this in the past:

"Q40: Thanks for changing the music for the Alte Roite mount! Please let me know if you have plans to change any of the other mount music. Also, do you have plans to add more variations for the general mount music?

A40: I understand there’s a request to change the BGM from the general ones, but for those that may have split opinions on which BGM to use, we use the general one.

The amount of data we can apply to mount BGM is also becoming very tight, so it would be difficult to answer all the requests, but we’re considering them based on everyone’s feedback, so please be sure to let us know!"
" (source)

Maybe if they upgrade and expand where all of this is stored, sure, but most of the store mounts play the POTD theme, save for a few others (magic carpet, red hare, and the nezha chariot share the Hullbreaker music as their theme, red baron and white devil play Steel Reason, Slepnir plays Odin's theme, and the SDS Fenrir plays the Motorcycle Chase theme from FF7.) That's not including mounts that were holiday rewards at some point, since those were never store exclusives when they were first introduced. A lot of the earnable mounts from Savage or EX fights and whatnot seem to get the special mount music, and I'd prefer that they keep doing that until they can expand their database for mounts and music attached.