Splatoon OST

Yeah, I know of that channel.

Still, if you're a tech geek, this is even better:

http://www.hcs64.com/mboard/forum.php?showthread=38505

You'll have to go through quite a few pages, but somewhere there is the Splatoon soundtrack as directly ripped from the game ROM. One conversion later, and you get it without any quality loss, unlike the versions on Youtube.