Nintendo's soundtracks have a unique charm that makes them almost inseperable from the games they're composed for, but I think it's a bit of a stretch to say that they're the only ones making unique music. FFXIII, and especially XIII-2, for example, both have extremely unique soundtracks. There's also Bravely Default(also SquEnix), LittleBigPlanet(not all original, but still counts, IMO), SCEJ games, ClaDun, basically every Sonic game ever, God Eater, Nier, Bastion, Superbrothers, Krater, Return All Robots, etc. etc.








