Alright so here's my list of what I'd love to hear in Smash, not necessarily what I think's gonna happen. In fact this is just some tracks that I really like/feel would be good in Smash.
Mother 1
Eight Melodies - Pretty obvious pick. The absence of the EM in the titles guarantees this track if Ninten gets in in my opinion. Plus I'd love to hear what the Smash team could do with that. Maybe blend it with Mother Earth?
All That I Needed Was You - It might only play once in the entire game and not be a good fighting track, but if they could mix Magicant into a Smash theme, sky's the limit. Maybe throw Fallin Love in there for a bit too.
Battle With a Dangerous Foe - I'd kill for this track. Maybe it could blend with Sanctuary Guardian? As long as I hear that ending melody I'm game. Mother is in dire need of more battle themes.
Wisdom of the World -
It's just a pretty track and I think it deserves more love.
Approaching Mt. Itoi/Mt. Itoi - These two would blend nicely in my opinion and would be perfect for a Mt. Itoi stage.
EarthBound
Twoson - I've always loved this town theme, it's probably my favorite in the game besides Onett.
Battle Theme Medley - There's too many good battle tracks to choose so I feel as though a medley would be able to do multiple tracks justice. Battle against a Machine, Mobile Opponent, and Otherworldly Foe I think would go together nicely.
Deep Darkness/Kraken of the Sea - Okay I know they don't really fit together in game but they blended Onett and Snowman once so... Either would be cool.
Porky Means Business - I don't think I need to give a reason for this one, but it would be baller as hell if it was interluded with Giygas battle snippets.
Mother 3
Strong One - This is a must if my boy Claus get in.
Beyond the Sunshine Forest - I've always liked this track for some reason, and hearing it orchestrated would probably make me immensely emotional.
Fate/Serious/Formidable Foe - Fate is such a good track, but it's too short to be played by itself, so pairing it up with a longer track would potentially work. I can see them blending nicely myself
MROB-6720M - I think it sounds cool. No other reason lulz. Maybe throw Tragic Reconstruction in there somewhere I dunno.
Natural Killer Cyborg - Self explanatory
Volcano! Inferno! - I once grinded in the Volcano area for four hours straight, so this music is ingrained into my head at this point. Hearing it in a Smash style would be amazing.
Mind of a Theif/Going Alone/Happy Town? - Any of these overworld themes would be nice.
Intense Guys - I LOVE THIS TRACK EVER SINCE I FIRST HEARD IT WITH THE ELDER BATTIES GAAAAAHHHH.
Monkey's Delivery Service - Cmon guys you all know you want this one.
Battle Against the Masked Man - Because I love to bawl my eyes out while playing video games. #swag
And that's music that I think would be great in Smash. Sorry about the M3 emphasis, I was listening to the soundtrack today.
I'm team 16 Melodies so I can listen to both together all while weeping like a baby. :')
Oh god I actually have a kinda funny story about my attempt at getting the Sword™ and I'm pretty sure I rage quit that day after my **** up heh.