I'm gonna go by series here for top 3 songs from each I want to see. [From the series we know that are in smash 4 thus far and the ones I guess are in still] I may have missed some series.. I'll fix that later if I have :P Mario
Zelda
Metroid
Kirby
Fire Emblem
Classic Megaman
Kid Icarus
Pokemon
Star Fox
Mother/Earthbound
Donkey Kong
Wario
classic Nintendo stuff along with Pikmin, and Animal Crossing i'm unsure Sonic [fairly sure he is returning ;P]
F-Zero [To be decided later] Metal Gear [to be decided later]