With the addition of boss theme music added to the primal mounts and Odin, it seems like a waste to have the ADS-looking mount not play that song that everyone knows, the boss theme for The Binding Coil of Bahamut turns 1-4, 6-8, and 10-11.

Certainly, I think this may have been more irritating than anything else if implemented at the time of the other mount musics, since everyone was... pretty sick of that song at that time. But now, when I'm not constantly having to listen to it during progression and farming, I think it would be neat and atmospheric for Calamity Unbound to play while riding the Logistics System.