Beyblade Burst Battle Zero unused files

So I’ve been looking around in the audio section of the romfs looking for the music and I found some music that I think is unrelated to the game. I’ve identified most of the songs but if someone could help identify the others that would be cool. I’ll leave an upload link for the songs in this post.
___ - Koga Ninja Scroll MV
BGM_SMK_MG3 - ???
BGM_SMK_MG13 - ???
kart_title.32 - Mario Kart Double Dash main theme
PIANO16 - possibly related to Cornelia Malecki Piano 16, also might be Concerto Pour Louka???
Soldier_Dream - OP from Saint Seiya
TOUGH_BOY - OP from Hokuto No Ken

Update: I used an online music identifier and could find the name for ___ and possibly PIANO16.