Sound Shapes is a title Vita owners are excited about and not many others have heard of. Here's the full demo video:
I apologize for my egregious error in not putting the headphones on the camera. The platforming is simple and interesting enough, but the real strength is in the music. In the demo, you'll see me collect music notes and each of those add a layer onto the background song. With the end of each level, the song morphs and shifts, allowing you to rebuild it and progressing the song. Even the other lifeforms make beats when touched!
Perhaps the gameplay is too simple to warrant being a full game, but I believe it deserves your attention, especially if you love music.