Nintendo has a lot of great music. You can't deny this. Unfortunately, Nintendo is only making money off a tiny fraction of this music (on an accessible storefront, at least).
Now, Nintendo also has a problem regarding the snail's pace at which titles are dripping out for the Wii U - and we've had a slowdown in titles for the 3DS as well.
The key here to partially solving both problems is exploiting one key niche that Nintendo hasn't fulfilled for a while. It's reviving (or expanding) their music-based franchises. Rhythm Heaven, Osu/Elite Beat Agents, and Harmoknight.
(DeDeDe Drum Dash technically counts as a rhythm game, but it's a minigame in Kirby: Triple Deluxe, and is a worse deal than Harmoknight, apparently...)
You'll have to take Game Freak away from Pokemon for Harmoknight (which is great because we've had Pokemon nearly annually for some time now, why not look into possible spin-offs, hmm?), and iNiS (Osu dev) has last developed a game on Nintendo platforms seven years ago (they develop smartphone RPGs now), and Nintendo SPD Group 1 may be relegated to Tomodachi Collection now that it's proven to be a success...
However, I believe that this will be beneficial to the bottom line of Nintendo in the long run.

I WON A BET AGAINST AZUREN! WOOOOOOOOOOAAAAAAAAHHHHHHHHHHHHHHHHHHH
:3








