I've been thinking about the Grant Kirkhope interview about music for a while, and was trying to come up with franchises with noteworthy memorable music. As far as 3rd parties go, the biggest ones I could think of for music would be Crash, Doom, Ninja Gaiden, Xenosaga, and Professor Layton. Xenosaga because if the Xenoblade Chronicles characters are out, and presumably Tekken as well if the moveset would be too complicated to translate into Smash, then the only other potential second rep for Bandai Namco they could realistically use are KOS-MOS, Agumon from Digimon, or Lloyd or a rep for the Tales series.