Mainly the music from Pokemon Heart Gold/Soul Silver and Pokemon Black/White.

But I really hate that you need some sort of Nintendo membership in order to actually use the app.

In the name of Bern

Metroid fusion

I'm hoping for DKC Tropical Freeze.

More Pokemon soundtracks would be good, for sure. Some 3DS soundtracks would be excellent too.

What I'm really wondering is how long they intend to wait after a game's release before adding its soundtrack to Nintendo Music. I'd love to jam out to some songs from Mario & Luigi Brothership on there. (No spoilers; I'm nowhere near done with the game.)

Definitely all of the soundtracks from the Xenoblade series!

S&S, LA, SFA, all metroid games

All the ones they ass-blasted people off of YouTube for sharing for free when they aren't making it available any other way.

crazy that they didnt add Mario 64 at launch