I'm gonna be honest: I kind of wish we went back to the approach Melee did with its soundtrack.
Rather than having a huge armada of composers, Melee only had a small handful. Generally, that game had a smaller, but overall more cohesive and memorable soundtrack. This isn't to say Brawl/Smash 4 didn't have great music, but I'm not sure if they really a hold a candle to the likes of Fountain of Dreams, Fire Emblem, Mute City or Venom.
And really, Melee also just had a soundtrack that felt more balanced for each series. Nowadays, we're constantly at each other's throats how much music a series should have or shouldn't/doesn't have, but in Melee, series had 1-3 tracks each and that was it. It felt more fair.
I just wish Sakurai would realize that sometimes, when it comes to music, bigger might not always mean better...and he actually has in the past: Kid Icarus Uprising featured a smaller but talented group of composers (Motoi Sakuraba, Yuzo Koshiro, Masafumi Takada, Noriyuki Iwadare, Takahiro Nishi, Yasunori Mitsuda) and they managed to produce one of the best soundtracks in any Nintendo title. With that game, it's
hit after
hit after
hit after
hit. IIRC there's around 70 tracks in KIU, and ALL of them being pure quality. With Brawl/Smash 4, it tends to be
hit or
miss.