Judging by the sound options menu of Excite Truck it looks like you'll be able to load in your own music via the SD card slot. The likely format for this would be MP3, I welcome the option.
3,020 news items
Super Smash Bros. Overload
8 player smash, new game modes, stage builder, and the return of Mewtwo
Amazon Reveals Unannounced Modes for Wii U Version of Smash Bros.
Another day, Another Smash Bros. leak
Fifth Annual NES Marathon scheduled for November 8th
More than 750 Games, 2 friends, and 1 great cause
Game Freak Exploring Amiibo Functionality
Gotta buy 'em all
Donkey Kong Country Returns to Virtual Console!
Only in Europe...
Nexis Games Releases New UCraft Information
Digging through the details
October CoroCoro Shows new details and Mega Pokemon for Omega Ruby and Alpha Sapphire
Bees, and birds, and dragons. Oh my!
GameCube Controller Confusion
You got my hopes up and then dashed them expertly, sir.
Fifteen "Nindies" Announced for IndieCade 2014
A glimpse into the future
Wii's World is not officially affiliated with Nintendo! (but they wish we were).