The theme that plays in the menu when you're selecting an event. Also in the 3DS version (it's in story mode) (I forgot to say this in version 1).
From bgm_streamfiles.awb, track 7.
Loop Start: 82623 samples
Loop End: 14104918 samples
Sample Rate: 48000 Hz
(And about that AI policy: Obviously, I don't use AI in any of my videos.)
Of course, I don't own the song or the game this comes from. All rights go to SEGA and Nintendo. (And I don't make money off of this.)