I added music to all the demos. There is only about 10 seconds of actual sound from the Wii U in the videos for Chase Mii (when match is won) and Battle Mii (when destroy ship text appears and short Metroid jingle plays). I tried to add appropriate music. For example, in Chase Mii a variation of the slide theme from Mario 64 did actually play in the demo (included the variation of the song from Super Mario Galaxy 2). We weren't able to get sound last year, but hopefully we will this year.