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.
___ - ??? but it sounds like an anime song
BGM_SMK_MG3 - ???
BGM_SMK_MG13 - ???
kart_title.32 - Mario Kart Double Dash main theme
PIANO16 - possibly related to Cornelia Malecki Piano 16, not really sure
Soldier_Dream - OP from Saint Seiya
TOUGH_BOY - OP from Hokuto No Ken