Okay so I have a few suggestions for new mounts that play a certain BGM when you ride them like the Primal Ponies, the Chocobo and the Magitek Reapers (inclues adjuestment sot existing mounts):

  • Polar Bear or Fenrir: Snowcloak Theme
  • Einhander: The Keeper of the Lake Theme
  • Mammoth: Dusk Vigil Theme
  • Twintania: Any of the Coil remixes to Answers (save T12's)
  • Anzu or Blue Elbst: Through the Gloom (Pharos Sirius Theme)
  • Black Drake: Somn Al Theme
As for how to obtain thee, well the new could be tied to mgp or a quest/achievement related to the theme they are using, or they could be drops from the HM versions of the dungoens (save Twin and Fenrir for obvious reasons)