Nintendo:

http://youtu.be/B0M_zZRn-yo

http://youtu.be/P0AhcENdc2s

Microsoft:

http://youtu.be/_FY8uedFyIk

http://youtu.be/1wrw9znSCxk

Sony:

http://youtu.be/Y97u-U0nvJM

http://youtu.be/vZHYQFBP8bw

Square Enix.

This. As much as I hate SE lately, one of the few things they keep doing right is the music, heck even FF 13 had a really good soundtrack.

But out of the big 3...well I can't really say because I haven't played enough Sony and MS games to make comparisons. 

SE, heres one of their most recent amazing ones.

Falcom.

for now I'd say sony.
I really like the soundtrakcs of beyond, GoW and TLoU

Square-Enix whether it's their Eidos games like Deus Ex, Nier, T3B, TWEWY, FF... they're all pretty awesome. Except for hitman absolution ^_^ too many inception horns.

Out of the big 3... I'd pick Sony I think if Journey counts as sony if not I pick nintendo. :D

This

But from the big 3 I would say hands down its Nintendo

Out of the big 3, I'd give it to Nintendo.

Square is definitely the best.

Nintendo

Knoami for Metal Gear Solid